Use x. Operators + − * / ^ % and parentheses. 2x, 2sin(x), x², and |x| work. A trailing % is percent.
Functions: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, sqrt, cbrt, abs, ln, log, exp, floor, ceil, round, sign, min, max. Constants: pi, e, tau. ln is natural log, log is base 10.
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