0.495 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.087 * * * [progress]: [2/2] Setting up program.
0.089 * [progress]: [Phase 2 of 3] Improving.
0.090 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (- (cos (+ x eps)) (cos x))
0.091 * * [simplify]: iteration  0 :  6  enodes  (cost  7 )
0.091 * * [simplify]: iteration  1 :  9  enodes  (cost  7 )
0.092 * * [simplify]: iteration  2 :  10  enodes  (cost  7 )
0.093 * * [simplify]: iteration  done :  10  enodes  (cost  7 )
0.093 * [simplify]: Simplified to:
   (- (cos (+ x eps)) (cos x))
0.094 * * [progress]: iteration 1 / 4
0.094 * * * [progress]: picking best candidate
0.095 * * * * [pick]: Picked  #<alt (λ (x eps) (- (cos (+ x eps)) (cos x)))>
0.095 * * * [progress]: localizing error
0.103 * * * [progress]: generating rewritten candidates
0.103 * * * * [progress]: [ 1 / 2 ] rewriting at (2 1)
0.108 * * * * [progress]: [ 2 / 2 ] rewriting at (2)
0.117 * * * [progress]: generating series expansions
0.117 * * * * [progress]: [ 1 / 2 ] generating series at (2 1)
0.117 * [approximate]: Taking taylor expansion of (cos (+ x eps)) in (x eps) around 0
0.117 * [taylor]: Taking taylor expansion of (cos (+ x eps)) in eps
0.117 * [taylor]: Taking taylor expansion of (+ x eps) in eps
0.117 * [taylor]: Taking taylor expansion of x in eps
0.117 * [taylor]: Taking taylor expansion of eps in eps
0.117 * [taylor]: Taking taylor expansion of (cos (+ x eps)) in x
0.117 * [taylor]: Taking taylor expansion of (+ x eps) in x
0.117 * [taylor]: Taking taylor expansion of x in x
0.117 * [taylor]: Taking taylor expansion of eps in x
0.117 * [taylor]: Taking taylor expansion of (cos (+ x eps)) in x
0.117 * [taylor]: Taking taylor expansion of (+ x eps) in x
0.117 * [taylor]: Taking taylor expansion of x in x
0.117 * [taylor]: Taking taylor expansion of eps in x
0.118 * [taylor]: Taking taylor expansion of (cos eps) in eps
0.118 * [taylor]: Taking taylor expansion of eps in eps
0.127 * [taylor]: Taking taylor expansion of (- (sin eps)) in eps
0.128 * [taylor]: Taking taylor expansion of (sin eps) in eps
0.128 * [taylor]: Taking taylor expansion of eps in eps
0.130 * [taylor]: Taking taylor expansion of (- (* 1/2 (cos eps))) in eps
0.130 * [taylor]: Taking taylor expansion of (* 1/2 (cos eps)) in eps
0.130 * [taylor]: Taking taylor expansion of 1/2 in eps
0.130 * [taylor]: Taking taylor expansion of (cos eps) in eps
0.130 * [taylor]: Taking taylor expansion of eps in eps
0.132 * [approximate]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in (x eps) around 0
0.132 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in eps
0.132 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.132 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.132 * [taylor]: Taking taylor expansion of eps in eps
0.132 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.132 * [taylor]: Taking taylor expansion of x in eps
0.133 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in x
0.133 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.133 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.133 * [taylor]: Taking taylor expansion of eps in x
0.133 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.133 * [taylor]: Taking taylor expansion of x in x
0.133 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in x
0.133 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.133 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.133 * [taylor]: Taking taylor expansion of eps in x
0.133 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.134 * [taylor]: Taking taylor expansion of x in x
0.134 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in eps
0.134 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.134 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.134 * [taylor]: Taking taylor expansion of eps in eps
0.134 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.134 * [taylor]: Taking taylor expansion of x in eps
0.135 * [taylor]: Taking taylor expansion of 0 in eps
0.135 * [taylor]: Taking taylor expansion of 0 in eps
0.135 * [taylor]: Taking taylor expansion of 0 in eps
0.135 * [approximate]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in (x eps) around 0
0.135 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in eps
0.135 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in eps
0.135 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.135 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.135 * [taylor]: Taking taylor expansion of eps in eps
0.136 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.136 * [taylor]: Taking taylor expansion of x in eps
0.136 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in x
0.136 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in x
0.136 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.136 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.136 * [taylor]: Taking taylor expansion of eps in x
0.136 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.136 * [taylor]: Taking taylor expansion of x in x
0.137 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in x
0.137 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in x
0.137 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.137 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.137 * [taylor]: Taking taylor expansion of eps in x
0.137 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.137 * [taylor]: Taking taylor expansion of x in x
0.138 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in eps
0.138 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in eps
0.138 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.138 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.138 * [taylor]: Taking taylor expansion of eps in eps
0.138 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.139 * [taylor]: Taking taylor expansion of x in eps
0.139 * [taylor]: Taking taylor expansion of 0 in eps
0.139 * [taylor]: Taking taylor expansion of 0 in eps
0.139 * [taylor]: Taking taylor expansion of 0 in eps
0.139 * * * * [progress]: [ 2 / 2 ] generating series at (2)
0.140 * [approximate]: Taking taylor expansion of (- (cos (+ x eps)) (cos x)) in (x eps) around 0
0.140 * [taylor]: Taking taylor expansion of (- (cos (+ x eps)) (cos x)) in eps
0.140 * [taylor]: Taking taylor expansion of (cos (+ x eps)) in eps
0.140 * [taylor]: Taking taylor expansion of (+ x eps) in eps
0.140 * [taylor]: Taking taylor expansion of x in eps
0.140 * [taylor]: Taking taylor expansion of eps in eps
0.140 * [taylor]: Taking taylor expansion of (cos x) in eps
0.140 * [taylor]: Taking taylor expansion of x in eps
0.140 * [taylor]: Taking taylor expansion of (- (cos (+ x eps)) (cos x)) in x
0.140 * [taylor]: Taking taylor expansion of (cos (+ x eps)) in x
0.140 * [taylor]: Taking taylor expansion of (+ x eps) in x
0.140 * [taylor]: Taking taylor expansion of x in x
0.140 * [taylor]: Taking taylor expansion of eps in x
0.140 * [taylor]: Taking taylor expansion of (cos x) in x
0.140 * [taylor]: Taking taylor expansion of x in x
0.140 * [taylor]: Taking taylor expansion of (- (cos (+ x eps)) (cos x)) in x
0.140 * [taylor]: Taking taylor expansion of (cos (+ x eps)) in x
0.140 * [taylor]: Taking taylor expansion of (+ x eps) in x
0.140 * [taylor]: Taking taylor expansion of x in x
0.140 * [taylor]: Taking taylor expansion of eps in x
0.140 * [taylor]: Taking taylor expansion of (cos x) in x
0.140 * [taylor]: Taking taylor expansion of x in x
0.141 * [taylor]: Taking taylor expansion of (- (cos eps) 1) in eps
0.141 * [taylor]: Taking taylor expansion of (cos eps) in eps
0.141 * [taylor]: Taking taylor expansion of eps in eps
0.141 * [taylor]: Taking taylor expansion of 1 in eps
0.143 * [taylor]: Taking taylor expansion of (- (sin eps)) in eps
0.143 * [taylor]: Taking taylor expansion of (sin eps) in eps
0.143 * [taylor]: Taking taylor expansion of eps in eps
0.147 * [taylor]: Taking taylor expansion of (- 1/2 (* 1/2 (cos eps))) in eps
0.147 * [taylor]: Taking taylor expansion of 1/2 in eps
0.147 * [taylor]: Taking taylor expansion of (* 1/2 (cos eps)) in eps
0.148 * [taylor]: Taking taylor expansion of 1/2 in eps
0.148 * [taylor]: Taking taylor expansion of (cos eps) in eps
0.148 * [taylor]: Taking taylor expansion of eps in eps
0.154 * [taylor]: Taking taylor expansion of (* 1/6 (sin eps)) in eps
0.154 * [taylor]: Taking taylor expansion of 1/6 in eps
0.154 * [taylor]: Taking taylor expansion of (sin eps) in eps
0.154 * [taylor]: Taking taylor expansion of eps in eps
0.163 * [taylor]: Taking taylor expansion of (- (* 1/24 (cos eps)) 1/24) in eps
0.163 * [taylor]: Taking taylor expansion of (* 1/24 (cos eps)) in eps
0.163 * [taylor]: Taking taylor expansion of 1/24 in eps
0.163 * [taylor]: Taking taylor expansion of (cos eps) in eps
0.163 * [taylor]: Taking taylor expansion of eps in eps
0.163 * [taylor]: Taking taylor expansion of 1/24 in eps
0.165 * [approximate]: Taking taylor expansion of (- (cos (+ (/ 1 eps) (/ 1 x))) (cos (/ 1 x))) in (x eps) around 0
0.165 * [taylor]: Taking taylor expansion of (- (cos (+ (/ 1 eps) (/ 1 x))) (cos (/ 1 x))) in eps
0.165 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in eps
0.165 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.165 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.165 * [taylor]: Taking taylor expansion of eps in eps
0.165 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.165 * [taylor]: Taking taylor expansion of x in eps
0.166 * [taylor]: Taking taylor expansion of (cos (/ 1 x)) in eps
0.166 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.166 * [taylor]: Taking taylor expansion of x in eps
0.166 * [taylor]: Taking taylor expansion of (- (cos (+ (/ 1 eps) (/ 1 x))) (cos (/ 1 x))) in x
0.166 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in x
0.166 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.166 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.166 * [taylor]: Taking taylor expansion of eps in x
0.166 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.166 * [taylor]: Taking taylor expansion of x in x
0.167 * [taylor]: Taking taylor expansion of (cos (/ 1 x)) in x
0.167 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.167 * [taylor]: Taking taylor expansion of x in x
0.167 * [taylor]: Taking taylor expansion of (- (cos (+ (/ 1 eps) (/ 1 x))) (cos (/ 1 x))) in x
0.167 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in x
0.167 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.167 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.167 * [taylor]: Taking taylor expansion of eps in x
0.167 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.167 * [taylor]: Taking taylor expansion of x in x
0.168 * [taylor]: Taking taylor expansion of (cos (/ 1 x)) in x
0.168 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.168 * [taylor]: Taking taylor expansion of x in x
0.168 * [taylor]: Taking taylor expansion of (- (cos (+ (/ 1 eps) (/ 1 x))) (cos (/ 1 x))) in eps
0.168 * [taylor]: Taking taylor expansion of (cos (+ (/ 1 eps) (/ 1 x))) in eps
0.169 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.169 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.169 * [taylor]: Taking taylor expansion of eps in eps
0.169 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.169 * [taylor]: Taking taylor expansion of x in eps
0.169 * [taylor]: Taking taylor expansion of (cos (/ 1 x)) in eps
0.169 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.169 * [taylor]: Taking taylor expansion of x in eps
0.170 * [taylor]: Taking taylor expansion of 0 in eps
0.173 * [taylor]: Taking taylor expansion of 0 in eps
0.176 * [taylor]: Taking taylor expansion of 0 in eps
0.177 * [approximate]: Taking taylor expansion of (- (cos (- (+ (/ 1 eps) (/ 1 x)))) (cos (/ -1 x))) in (x eps) around 0
0.177 * [taylor]: Taking taylor expansion of (- (cos (- (+ (/ 1 eps) (/ 1 x)))) (cos (/ -1 x))) in eps
0.177 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in eps
0.177 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in eps
0.177 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.177 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.177 * [taylor]: Taking taylor expansion of eps in eps
0.177 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.177 * [taylor]: Taking taylor expansion of x in eps
0.178 * [taylor]: Taking taylor expansion of (cos (/ -1 x)) in eps
0.178 * [taylor]: Taking taylor expansion of (/ -1 x) in eps
0.178 * [taylor]: Taking taylor expansion of -1 in eps
0.178 * [taylor]: Taking taylor expansion of x in eps
0.178 * [taylor]: Taking taylor expansion of (- (cos (- (+ (/ 1 eps) (/ 1 x)))) (cos (/ -1 x))) in x
0.178 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in x
0.178 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in x
0.178 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.178 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.178 * [taylor]: Taking taylor expansion of eps in x
0.178 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.178 * [taylor]: Taking taylor expansion of x in x
0.179 * [taylor]: Taking taylor expansion of (cos (/ -1 x)) in x
0.179 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.179 * [taylor]: Taking taylor expansion of -1 in x
0.179 * [taylor]: Taking taylor expansion of x in x
0.179 * [taylor]: Taking taylor expansion of (- (cos (- (+ (/ 1 eps) (/ 1 x)))) (cos (/ -1 x))) in x
0.179 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in x
0.179 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in x
0.179 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in x
0.179 * [taylor]: Taking taylor expansion of (/ 1 eps) in x
0.179 * [taylor]: Taking taylor expansion of eps in x
0.179 * [taylor]: Taking taylor expansion of (/ 1 x) in x
0.179 * [taylor]: Taking taylor expansion of x in x
0.180 * [taylor]: Taking taylor expansion of (cos (/ -1 x)) in x
0.180 * [taylor]: Taking taylor expansion of (/ -1 x) in x
0.180 * [taylor]: Taking taylor expansion of -1 in x
0.180 * [taylor]: Taking taylor expansion of x in x
0.181 * [taylor]: Taking taylor expansion of (- (cos (- (+ (/ 1 eps) (/ 1 x)))) (cos (/ -1 x))) in eps
0.181 * [taylor]: Taking taylor expansion of (cos (- (+ (/ 1 eps) (/ 1 x)))) in eps
0.181 * [taylor]: Taking taylor expansion of (- (+ (/ 1 eps) (/ 1 x))) in eps
0.181 * [taylor]: Taking taylor expansion of (+ (/ 1 eps) (/ 1 x)) in eps
0.181 * [taylor]: Taking taylor expansion of (/ 1 eps) in eps
0.181 * [taylor]: Taking taylor expansion of eps in eps
0.181 * [taylor]: Taking taylor expansion of (/ 1 x) in eps
0.181 * [taylor]: Taking taylor expansion of x in eps
0.182 * [taylor]: Taking taylor expansion of (cos (/ -1 x)) in eps
0.182 * [taylor]: Taking taylor expansion of (/ -1 x) in eps
0.182 * [taylor]: Taking taylor expansion of -1 in eps
0.182 * [taylor]: Taking taylor expansion of x in eps
0.183 * [taylor]: Taking taylor expansion of 0 in eps
0.186 * [taylor]: Taking taylor expansion of 0 in eps
0.189 * [taylor]: Taking taylor expansion of 0 in eps
0.189 * * * [progress]: simplifying candidates
0.190 * [simplify]: Simplifying using  #<procedure:simplify-batch-regraph> :
   (expm1 (cos (+ x eps)))
  (log1p (cos (+ x eps)))
  (* (cos x) (cos eps))
  (* (sin x) (sin eps))
  (log (cos (+ x eps)))
  (exp (cos (+ x eps)))
  (* (cbrt (cos (+ x eps))) (cbrt (cos (+ x eps))))
  (cbrt (cos (+ x eps)))
  (* (* (cos (+ x eps)) (cos (+ x eps))) (cos (+ x eps)))
  (sqrt (cos (+ x eps)))
  (sqrt (cos (+ x eps)))
  (fma (* (cbrt (cos (+ x eps))) (cbrt (cos (+ x eps)))) (cbrt (cos (+ x eps))) (- (* (cbrt (cos x)) (* (cbrt (cos x)) (cbrt (cos x))))))
  (fma (- (cbrt (cos x))) (* (cbrt (cos x)) (cbrt (cos x))) (* (cbrt (cos x)) (* (cbrt (cos x)) (cbrt (cos x)))))
  (fma (* (cbrt (cos (+ x eps))) (cbrt (cos (+ x eps)))) (cbrt (cos (+ x eps))) (- (* (sqrt (cos x)) (sqrt (cos x)))))
  (fma (- (sqrt (cos x))) (sqrt (cos x)) (* (sqrt (cos x)) (sqrt (cos x))))
  (fma (* (cbrt (cos (+ x eps))) (cbrt (cos (+ x eps)))) (cbrt (cos (+ x eps))) (- (* (cos x) 1)))
  (fma (- (cos x)) 1 (* (cos x) 1))
  (fma (sqrt (cos (+ x eps))) (sqrt (cos (+ x eps))) (- (* (cbrt (cos x)) (* (cbrt (cos x)) (cbrt (cos x))))))
  (fma (- (cbrt (cos x))) (* (cbrt (cos x)) (cbrt (cos x))) (* (cbrt (cos x)) (* (cbrt (cos x)) (cbrt (cos x)))))
  (fma (sqrt (cos (+ x eps))) (sqrt (cos (+ x eps))) (- (* (sqrt (cos x)) (sqrt (cos x)))))
  (fma (- (sqrt (cos x))) (sqrt (cos x)) (* (sqrt (cos x)) (sqrt (cos x))))
  (fma (sqrt (cos (+ x eps))) (sqrt (cos (+ x eps))) (- (* (cos x) 1)))
  (fma (- (cos x)) 1 (* (cos x) 1))
  (fma 1 (cos (+ x eps)) (- (* (cbrt (cos x)) (* (cbrt (cos x)) (cbrt (cos x))))))
  (fma (- (cbrt (cos x))) (* (cbrt (cos x)) (cbrt (cos x))) (* (cbrt (cos x)) (* (cbrt (cos x)) (cbrt (cos x)))))
  (fma 1 (cos (+ x eps)) (- (* (sqrt (cos x)) (sqrt (cos x)))))
  (fma (- (sqrt (cos x))) (sqrt (cos x)) (* (sqrt (cos x)) (sqrt (cos x))))
  (fma 1 (cos (+ x eps)) (- (* (cos x) 1)))
  (fma (- (cos x)) 1 (* (cos x) 1))
  (expm1 (- (cos (+ x eps)) (cos x)))
  (log1p (- (cos (+ x eps)) (cos x)))
  (- (cos x))
  (- (cos x))
  (- (cos x))
  (* (sin (/ (- (+ x eps) x) 2)) (sin (/ (+ (+ x eps) x) 2)))
  (/ (exp (cos (+ x eps))) (exp (cos x)))
  (log (- (cos (+ x eps)) (cos x)))
  (exp (- (cos (+ x eps)) (cos x)))
  (* (cbrt (- (cos (+ x eps)) (cos x))) (cbrt (- (cos (+ x eps)) (cos x))))
  (cbrt (- (cos (+ x eps)) (cos x)))
  (* (* (- (cos (+ x eps)) (cos x)) (- (cos (+ x eps)) (cos x))) (- (cos (+ x eps)) (cos x)))
  (sqrt (- (cos (+ x eps)) (cos x)))
  (sqrt (- (cos (+ x eps)) (cos x)))
  (- (pow (cos (+ x eps)) 3) (pow (cos x) 3))
  (+ (* (cos (+ x eps)) (cos (+ x eps))) (+ (* (cos x) (cos x)) (* (cos (+ x eps)) (cos x))))
  (- (cos x))
  (- (* (cos (+ x eps)) (cos (+ x eps))) (* (cos x) (cos x)))
  (+ (cos (+ x eps)) (cos x))
  (+ (sqrt (cos (+ x eps))) (sqrt (cos x)))
  (- (sqrt (cos (+ x eps))) (sqrt (cos x)))
  (- (cos (+ x eps)) (cos x))
  (+ (* (sin x) (sin eps)) (cos x))
  (- (cos x))
  (- 1 (+ (* x eps) (* 1/2 (pow x 2))))
  (cos (+ x eps))
  (cos (+ x eps))
  (- (* 1/6 (* (pow x 3) eps)) (+ (* x eps) (* 1/2 (pow eps 2))))
  (- (cos (+ x eps)) (cos x))
  (- (cos (+ x eps)) (cos x))
0.193 * * [simplify]: iteration  0 :  91  enodes  (cost  664 )
0.211 * * [simplify]: iteration  1 :  198  enodes  (cost  540 )
0.246 * * [simplify]: iteration  2 :  518  enodes  (cost  453 )