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$ACOS(n) Function

This math function will return the ArcCosine of n where n is a number, variable that represents a number, or a math equation that returns a number. The ArcCosine is the angle in radians whose Cosine is equal to n. If n is less than -1 or greater than 1, an overflow will result and the word "Overflow" will be returned. To calculate the ArcCosine in degrees, use $DEG($ACOS(n)) instead.

Examples:

$ACOS(-0.5) returns 2.0943951
$DEG($ACOS(-0.5)) returns 120
$DEG($ACOS(0.5)) returns 60