acos() function returns the arc-cosine of the given number.
This function is defined in <math.h> header file.
|x||Required||Specifies a floating point value in the interval [-1, +1].|
|Number||The arc-cosine of the given number.|
The return value will be between 0 and π, if the given value is between -1 and 1.
The return value is represented in radians.
|NaN||If the given value is not between -1 and 1.|
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