0.052 * [progress]: [Phase 1 of 3] Setting up.
0.001 * * * [progress]: [1/2] Preparing points
0.230 * * * [progress]: [2/2] Setting up program.
0.235 * [progress]: [Phase 2 of 3] Improving.
0.235 * [simplify]: Simplifying:
  (- (tan (+ x eps)) (tan x))