Download SWI-Prolog or simply open SWISH. Open this program, and in the query type

main.

and press ctrl+enter. The calculator understands trigonometric, cyclometric and hyperbolic functions as well as logarithms. It can also work out complicated composite derivatives. Unfortunately, the output isn't simplified.
_{(automatic simplification may be added in the future)}

To ensure that the program understands your input function correctly, please follow these guidelines:

• Your only variable should be x
• Use * for multiplication, / for division and ^ for powers
• Always use * with constant terms, write 3*x instead of 3x
• Use tg(x) and ctg(x) for tangent and cotangent (likewise with cyclometric and hyperbolic functions)
• Use log(a, x) for logarithm base a of x, you can also use ln(x) for natural logarithm
• When rising x or a function of x to a fractional power, use brackets, e.g. x^(1/3) instead of x^1/3
• Use brackets when dividing long formulas, x/cos(x)*sin(x) is equal to (x*sin(x))/cos(x), not x/(sin(x)*cos(x))
• Likewise, use brackets when rising something to a composite exponent, e.g. 2^(sin(x)*x) instead of 2^sin(x)*x