std::asin

From Cppreference

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Defined in header <cmath>
float       asin( float arg );
double      asin( double arg );
long double asin( long double arg );

Computes arc sine of arg

[edit] Parameters

arg

-

floating point value

[edit] Return value

arc sine of arg in radians in the range of [-π/2; π/2] radians.

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

[edit] See also

acos	computes arc cosine (arccos(x)) (function)
atan	computes arc tangent (arctan(x)) (function)
atan2	arc tangent, using signs to determine quadrants (function)
sin	computes sine (sin(x)) (function)