What are the formulas for COS, TAN, and SIN?

I'm guessing that you don't really want the formulas.  I think what you actually want is the definitions of those functions of an acute angle when it's in a right triangle.Cosine = (adjacent side) / (hypotenuse)Tangent = (opposite side) / (adjacent side)Sine = (opposite side) / (hypotenuse)Tell me if I'm wrong, and I'll find some formulas for you.