TAN(3) Library Functions Manual TAN(3)

tan, tanf
tangent function

Math Library (libm, -lm)

#include <math.h>

double
tan(double x);

float
tanf(float x);

The tan() and tanf() functions compute the tangent of x (measured in radians). A large magnitude argument may yield a result with little or no significance. For a discussion of error due to roundoff, see math(3).

The tan() function returns the tangent value.

acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tanh(3)

The tan() function conforms to ANSI X3.159-1989 (“ANSI C89”).
May 2, 1991 NetBSD 9.0