Operator: Cosine

Operator: Cosine is a Number Spell Piece added by Psi. It will return the cosine of a number. 
Some helpful values are:
* 0 = \cos({\frac{\pi}{2}}) = \cos({\frac{3\pi}{2}})
* 1 = \cos(0)
* -1 = \cos(\pi)
It is unlocked in the lesson "Trigonometry."
== Parameters ==
* Target: Requires a number.
Category:PsiCategory:Spell Pieces