📈 Adaptive Derivatives Trainer — Business Calculus
- Starts with easy rules (constant, power, constant multiple, sum/difference, exponential, quotient),
then automatically moves to chain rule and product rule as you improve.
- Includes critical values, second derivative, inflection point, closed-interval optimization, and L'Hôpital's rule.
- Optimization now includes quadratic (unconstrained), cubic special form, and sum of squares in b (least squares).
- Test generator (exam-weighted) builds a proportional test from sections.
- Follow‑up Q&A: one follow‑up per question; export CSV includes original item + follow‑up Q/A.
Tips: You can type e^(x^2), exp(x^2), ln(x), ^ or ** for powers, and \cdot or *.