tan

Syntax

#include <math.h> double tan(double x);

Description

This function computes the tangent of x (which should be given in radians).

Return Value

The tangent of x. If the absolute value of x is finite but greater than or equal to 2^63, the return value is 0 (since for arguments that large each bit of the mantissa is more than Pi). If the value of x is infinite or NaN, the return value is NaN and errno is set to EDOM.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001