Simple Calculator

Have you ever started planning a project in Minecraft by looking furiously for your calculator to find out how many resources you need? Yeah... that rarely happens.

But IF that happens, you will be delighted to see, that now there is an IN-GAME-CALCULATOR by your side. Finally you know what sin(e*pi) is, without even closing minecraft. A dream come true.

Features

This mod adds a simple calculator, which allows you to enter calculations with your keyboard. You can also define variables and use its functions:

functions: use them by typing: <func>(<expression>)

• sin(x) -> returns the sin of x (in radians)
• cos(x) -> returns the cos of x (in radians)
• asin(x) -> returns the asin of x (in radians)
• acos(x) -> returns the acos of x (in radians)
• sqrt(x) -> returns the sqare root of x
• fac(x) -> returns the factorial of x (positiv integer)
• exp(x) -> returns e^x

Also: Type 'help' to get a list with other useful commands. 

I presume that most of these functions have no use in a context of minecraft, but they are the essentials of any calculator. 

If you have any ideas on how to improve this calculator, please let me know. I´ll gladly add new functions or any other interesting features. :)