# TAN Function in C

The C tan Function is a C Math Library Function. It is helpful to calculate the Trigonometry Tangent value for the specified expression. The syntax of the tan in C Programming is

`double tan(double number);`

Let us see the mathematical formula behind this Trigonometry Tangent function:

Tan(x) = Length of the Opposite Side / Length of the Adjacent Side

## TAN Function in C Example

The tan function in the C math library allows you to calculate the trigonometric Tangent for the specified values.

This program asks the user to enter his/her own value. Then it will find the tangent value of the user-specified value. Please refer to the C ATAN Function article to calculate the Arc Tangent of the specified expression.

```/* Example for TAN Function in C Programming */

#include <stdio.h>
#include <math.h>

int main()
{
double tanValue, number;
printf(" Please Enter the Value to Calculate Tangent :  ");
scanf("%lf", &number);

tanValue = tan(number);

printf("\n The Tangent, or Tan value of %lf = %f ", number, tanValue);

return 0;
}```

## C TANGENT Function Example 2

This C Programming example allows the user to enter the value in degrees. Next, we are converting the degrees to Radians. And finally, we are finding the Tangent value of the radian

```/* Example for TAN Function in C Programming */

#include <stdio.h>
#include <math.h>

#define PI 3.1415926
int main()
{
printf(" Please Enter an Angle in degrees :  ");
scanf("%lf", &degreeVal);

// Convert Degree Value to Radian
`````` Please Enter an Angle in degrees :  60