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NAME
atan, atanf, atanl - arc tangent functionSYNOPSIS
#include <math.h> double atan(double x); float atanf(float x); long double atanl( long double x);
DESCRIPTION
The atan() function calculates the arc tangent of x; that is the value whose tangent is x.RETURN VALUE
The atan() function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99 requirements.SEE ALSO
acos(3), asin(3), atan2(3), cos(3), sin(3), tan(3)-
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