Make Math Work

ArcCosine

Usage:	ArcCosine Cosine
	ArcCos Cosine
	ACos Cosine

The ArcCosine command returns the angle in radians of the entered Cosine. This is the inverse function of Cosine.

The argument entered with ArcCosine must be -1 <= Argument <= 1.

Examples:
ArcCosine .5 returns 1.0472.
ArcCosine (cos(.5)) returns 0.5.

Try It

Enter a number between -1 and 1: