Make Math Work

ArcCosine

Usage:	ArcTan Tangent
	ATan Tangent
	ArcTangent Tangent

The ArcTan command returns the angle in radians of the entered Tangent. This is the inverse function of Tangent.

Examples:
ArcTan .707 returns 0.615408517629256.
ArcTan (tan(.707)) returns .707.

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