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atanf(3m) [opensolaris man page]

atan(3M)						  Mathematical Library Functions						  atan(3M)

NAME
atan, atanf, atanl - arc tangent function SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double atan(double x); float atanf(float x); long double atanl(long double x); DESCRIPTION
These functions compute the principal value of the arc tangent of x. RETURN VALUES
Upon successful completion, these functions return the arc tangent of x in the range [-pi/2,pi/2] radians. If x is NaN, NaN is returned. If x is +-0, x is returned. If x is +-Inf, +-pi/2 is returned. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
atan2(3M), isnan(3M), math.h(3HEAD), tan(3M), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 atan(3M)

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