The **`tan()` function** returns the tangent of a number. To be more specific, it returns the tangent of a number in radians. 

Figure 1 shows the mathematical representation of the `tan()` function.

>Note:
>- The `math` module is required for this function.
>- This `tan()` function only works for right-angled triangles. 


# Syntax
```python
tan(num)
```
# Parameter
This function requires a `number` that represents an `angle` in `radians` as a parameter.

To convert `degrees` to `radians`, use the following formula:
```python
radians = degrees * ( pi / 180.0 )
```

# Return value
`tan()` returns the `tangent` of a number `(radians)` that is sent as a parameter. The return value is in the range `[-1,1]`.

# Example


import math

#positive number in radians
print "The value of tan(2.3) : ",  math.tan(2.3)

#negative number in radians
print "The value of tan(-2.3) : ",  math.tan(-2.3)

#converting the degrees angle into radians and then applying tan()
#degrees = 45
#PI = 3.14159265
result = 45.0 * (math.pi / 180.0)
print "The value of tan("+str(result)+") : ",  math.tan(result)

What is math.tan() in Python?

Returns the tangent of a given angle in radians using the math module in Python.