0.050 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.313 * * * [progress]: [2/2] Setting up program.
0.316 * [progress]: [Phase 2 of 3] Improving.
0.316 * [simplify]: Simplifying:
  (- (tan (+ x eps)) (tan x))
0.316 * [simplify]: Sending expressions to egg_math:
 (- (tan (+ h0 h1)) (tan h0))