CplxCalPro 1.34

the author of this app says:

If your looking for a graphical calculator with a ton of functions and built-in constants then you've come to the right place.

With 170 functions, eight different display formats, and 30 built-in constants, this calculator is definitely classy. You can program this powerful graphical calculator just for your hand held.

This calculator can be a mathematician's best friend.