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ATAN(3) BSD Library Functions Manual ATAN(3) NAME atan -- arc tangent function of one variable SYNOPSIS #include <math.h> double atan(double x); long double atanl(long double x); float atanf(float x); DESCRIPTION The atan() function computes the principal value of the arc tangent of x. The result is in the range [-pi/2, +pi/2]. SPECIAL VALUES atan(+-0) returns +-0. atan(+-infinity) returns +-pi/2 SEE ALSO acos(3), asin(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tan(3), tanh(3), math(3) The atan() function conforms to ISO/IEC 9899:1999(E). BSD November 18, 2002 BSD |