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atan(3) [freebsd man page]

ATAN(3) 						   BSD Library Functions Manual 						   ATAN(3)

atan, atanf, atanl -- arc tangent functions of one variable LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double atan(double x); float atanf(float x); long double atanl(long double x); DESCRIPTION
The atan(), atanf(), and atanl() functions compute the principal value of the arc tangent of x. RETURN VALUES
These functions return the arc tangent in the range [-pi/2, +pi/2] radians. SEE ALSO
acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3) STANDARDS
The atan(), atanf(), and atanl() functions conform to ISO/IEC 9899:1999 (``ISO C99''). BSD
July 31, 2008 BSD

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