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

NAME
     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 [-π/2, +π/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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