# Library Function Math h Tan()

## Tan() library function in Math

The `tan()` function is a part of the C math library and is used to calculate the tangent of a given angle. The angle is specified in radians. The `tan()` function takes a single argument, which is the angle in radians for which the tangent is to be calculated. The tangent of an angle is the ratio of the length of the side opposite the angle to the length of the side adjacent to the angle in a right triangle. Let us understand more about Library Function Math h Tan().

### Library Function Math h Tan()

The `tan()` function takes a single argument of type `double`, `float`, or `long double` and returns the tangent of the angle as a value of the same type. Here is the syntax for the `tan()` function in C:

`#include double tan(double x);float tanf(float x);long double tanl(long double x);`

Here is an example of how to use the `tan()` function in C:

Run
```#include<stdio.h>
#include<math.h>
int main()
{
double angle = 1.57;
double tangent = tan(angle);
printf("The tangent of %f is %f\n", angle, tangent);
return 0;
}
```

### Output

`The tangent of 1.570000 is 1255.765592`

Keep in mind that the tan() function works with angles specified in radians, not degrees.  To convert an angle from degrees to radians, you can use the following formula:

`radians = degrees * (M_PI / 180)`

Where M_PI is a predefined constant in the math.h library that represents the value of pi.

### Some facts about Ctan() function

• The `tan()` function is a mathematical function that calculates the tangent of an angle.
• The `tan()` function is defined in the C math library, which is typically included in C programs using the `#include ` directive.
• The `tan()` function takes a single argument, which is the angle in radians for which the tangent is to be calculated.
• The `tan()` function returns a value of type `double`, `float`, or `long double`, depending on the type of the argument.
• The `tan()` function is an element of the trigonometric functions, which also include `sin()`, `cos()`, `cot()`, `sec()`, and `csc()`.
• The tangent of an angle is the ratio of the length of the side opposite the angle to the length of the side adjacent to the angle in a right triangle.
• The `tan()` function is closely related to the `sin()` and `cos()` functions, as the tangent of an angle is equal to the sine of the angle divided by the cosine of the angle.

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