For calculators that do not have specific buttons for inverse logs, you can use exponentiation functions instead. For instance, x^y is a common function in many calculators to raise x to the power of ...

For doing advanced math calculation using sine, cosine, and logarithm functions, bc provides a standard math library. It can be used by loading it using a command-line option --mathlib or -l with bc.

The iPhone's scientific calculator provides exponential, logarithmic and trigonometric functions. It even has some hidden functions that reveal themselves if you hit the button that reads ‘2nd'.