LogPi Calc is a scientific calculator that packs about 50 mathematical functions in a simple, uncluttered interface. It includes trigonometric functions (sin, cos, sinh, cosh, asin, etc.), some statistics (mean, mode, sum, etc.), factorial, combinations and permutations, random number generators and much more.
It has an intuitive syntax that supports complex mathematical expressions.
The same screen is used to input expressions and display results so you can easily scroll up to see the history of your calculations.