David
Farruggio

MathGenie

acos

Inverse cosine in radians

Syntax and Description

acos(x) returns the inverse cosine (cos^-1) of the elements of x. The acos function operates element-wise on arrays. For real elements of x in the interval [-1,1], acos(x) returns real values in the interval [0,pi]. For real values of x outside the interval [-1,1] and for complex values of x, acos(x) returns complex values. All angles are in radians.

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