Evaluate a mathematical expression in one call. Supports + - * / ^ % ! and parentheses; array literals like [1,2,3] for statistics and [[1,2],[3,4]] for linear algebra. Functions: sqrt, cbrt, abs, pow, exp, log, ln, log10, log2, nthRoot, gcd, lcm, factorial, sign, hypot, mod, sin, cos, tan, asin, acos, atan, atan2, sinh, cosh, tanh, floor, ceil, round, min, max, isPrime, combinations, permutations, mean, median, std, sum, prod, variance, mode, det, inv, transpose, norm, dot, cross. Constants: pi, e, tau. Pass named values via 'variables' (e.g. { x: 2 }) to reference them in the expression. Example: '2 * (12 + sqrt(255))^2'

Simplify a mathematical expression algebraically (collect like terms, fold constants). Free variables stay symbolic; values passed in 'variables' are folded in as known constants. Note: simplification is heuristic — e.g. 'x/x' simplifies to 1 (dropping x != 0) — and it does not expand products or factor polynomials.

Compute the symbolic derivative (differentiation) of a math expression with respect to a variable. Example: expression 'x^3 + sin(x)' with variable 'x' yields '3 * x ^ 2 + cos(x)'. Other symbols in the expression are treated as free constants; the result is simplified.