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C COMPILER LIBRARY FUNCTION REFERENCE->Detailed Descriptions->atan() atanl()

Summary

#include <math.h>
    

double atan(double x)	Calculate arc tangent to double precision
long double atanl(long double x)	Calculate arc tangent to long double precision

Parameter
    

x	Value whose arc tangent is to be calculated.

Description

These functions calculate the arc tangent of x.


Return

These functions return the arc tangent between pi/2 and pi/2 of the value passed.