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ATAN(3) FreeBSD 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 [-pi/2, +pi/2] radi- ans. 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"). FreeBSD 13.0 July 31, 2008 FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS
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