=====asin=====
Syntax:

<code>
    #include <cmath>
    double asin( double arg );
</code>
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.

C++ also provides the following overloaded forms:
<code>
    #include <cmath>
    float asin( float arg ); // same as asinf() in C99
    long double asin( long double arg ); // same as asinl() in C99
</code>

Related Topics: [[acos]], [[atan]], [[atan2]], [[cos]], [[cosh]], [[sin]], [[sinh]], [[tan]], [[tanh]]