Cos

Returns the cosine of the angle (expressed in radians).

Cos(angle)

angle = angle in radians whose cosine you want to calculate

Remarks

If your angle is expressed in degrees, you can multiply it by pi/180 or use the Radians function.

Cos(0) = 1
Cos(PI/2) = 0
Cos(45*PI/180) = 0.7071... (square root of 2 divided by 2)