Declaration:
float asin(float x);
Description
The asin function calculates the arc sine of the floating-point number x. The argument x should range from -1 to 1, otherwise the result will be equal to PI/2 (for x > 1) or to -PI/2 (for x < -1). The function returns value in the range from -PI/2 to PI/2.
Returned value
The asin function returns the arc sine of argument x.
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