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# tan

Tangent function View other versions (4)

## Interface

#include <math.h>double tan (double x)long tanl (long double x)float tanf (float x)#include <complex.h>complex tan (complex x)double complex ctan (double complex x)float complex ctan (float complex x)long double complex ctanl (long double complex x)

## Description

The tan function computes the tangent of x (measured in radians). This is identical to the calculation of Example:
##### Example - Tangent function
Workings
#include <stdio.h>
#include <math.h>
int main()
{
double x = 0.3333;
double result = tan(x);
printf("The tangent of %.4lf is %.4lf\n", x, result);
return 0;
}
Solution
Output:
The tangent of 0.3333 is 0.3462

## Special Values

tan ( ±0 ) returns ±0.

tan ( ±∞ ) returns a NaN and raises the invalid floating-point exception.

## Standards

The tan function conforms to ISO/IEC 9899:1999(E).

## Compatibility

DOSUNIXWindowsANSI CC++ only
tanlâ€¢â€¢
Real tanâ€¢â€¢â€¢â€¢
Complex tanâ€¢â€¢â€¢
Complex ctanâ€¢â€¢