COS is the basic trigonometric COSINE function.

SYNTAX:

COS(Cx or Exp)
where :
Cx is a conditional variable x
Exp is a Expression

NOTES:

IMPORTANT: Most trigonometric functions expect degrees on input and return their results in degrees (when possible) as well.  To convert radians to degrees, multiply radians by 180/PI.  Functions such as ARCSIN expect their input to range from -1 to 1.