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Defined in header <math.h>
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float       acosf( float arg );
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double      acos( double arg );
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long double acosl( long double arg );
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Computes arc cosine of arg

Parameters

arg - floating point value

Return value

Arc cosine of arg in radians in the range of [0; π] radians.

Domain error occurs if arg is outside the range [-1.0; 1.0]. NAN is returned in that case.

See also

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