input your expression using the following functions:
abs, acos, acosh, asin, asinh, atan, atan2, atanh, cos, cosh, exp, expm1, log, log10, log1p, pi, pow, sin, sinh, sqrt, tan, tanh
name your variable x. notate powers using the pow(a,b) function. a^b doesn't work here. explicitly include the multiplication operator; i.e., use 2*x instead of 2x.