trig sin, cos, tan, cot, sec, csc
inverse asin, acos, atan, atan2, acot
hyperbolic sinh, cosh, tanh, asinh, acosh, atanh
exp/log exp, log, log2, log10, sqrt, Abs
complex re, im, conjugate
misc sign, floor, ceiling, Min, Max, Piecewise
constants pi, E, I
operators + - * / ** ( )