please add arcsin, arccos, arctan to speedcrunch

Originally reported on Google Code with ID 31 ``` What steps will reproduce the problem? 1. try to calculate arcsin(0.5)

What is the expected output? What do you see instead? expecting: 30° or 0.5235.. what i see: Error: Undefined variable'arcsin'

What version of the product are you using? On what operating system? 0.7-beta2 kubuntu feisty 7.04

Please provide any additional information below. today i had to make a quick arcsin. i saw that speedcrunch has sin, but not arcsin. sadly i had to search my TI89 after that. would be handy to have it. ```

Reported by `fryx.asraniel` on 2007-05-07 21:37:50

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