C Reference function asin()

Usage of asin():

double asin(double x);

The value of x must be within the range of -1 to +1 (inclusive).

The returned value is in the range of -p/2 to +p/2 (inclusive).

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double acos(double x);

The value x must be within the range of -1 to +1 (inclusive).

The returned value is in the range of 0 to pi (inclusive).

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