acos |
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acos |
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acos |
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acos |
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double acos( double x )
double x; /* double value */
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Synopsis |
#include "math.h"
The acos function returns the value, in radians, of the arc cosine, or cos-1 of x .
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Parameters |
x must be in the range of [-1,1].
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Return Value |
acos returns a value in the range of [0, π], provided x is in the specified range; otherwise, acos returns 0.0, and sets errno (the system error variable) to EDOM.
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See Also |
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