I dont really get the Sqrt, Abs, Sin and other things that the last box in the operators file is. what do all of those abs, sqrt, and In mean?
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Sqrt finds the square root of the number in the box. Abs means absolute number, which basically finds the number's distance from zero, meaning it turns a negative number to a positive but not the other way around.
The rest is a lot more complicated to explain. If you haven't started learning trigonometry in school yet, you'll have trouble understanding it all. For more info, look here: http://en.wikipedia.org/wiki/Trigonometry
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