C++ Programming/Code/Standard C Library/Functions/asin
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asin[edit | edit source]
#include <cmath> double asin( double arg );
The asin() function returns the arc sine of arg, which will be in the range [-pi/2, +pi/2]. arg should be between -1 and 1. If arg is outside this range, asin() returns NAN and raises a floating-point exception.