# Python – Find Sine – sin() Function with Examples

`sin()` function is used to find the sine of given argument in radians. Where sine is a trigonometric function which represents the ratio between hypotenuse and opposite. sine() function is a part of python programming language.

## Syntax of `sin()` Function

The syntax of `sin()` function in Python is:

```math.sin(x)
```

## Parameters of `sin()` Function in Python

`x` – Where `x` is any valid python number (positive or negative). This parameter is required.
Note: If the `x` parameter is not a number, `sin()` function will return an `Error`.

## Compatibility

`sin()` function is available and compatible with both Python `2.x` and `3.x`. This function is a part of the python standard math library.

## Return Value of `sin()` Function in Python

`sin()` function returns the sine of a given input (x – parameter) in radians.

## Python `sin()` Function Example

```# import math library
import math
print(math.sin(-0.))
print(math.sin(0))
print(math.sin(0.88))
print(math.sin(69))
print(math.sin(-4539))
```

Output:
```-0.0 0.0 0.7707388788989693 -0.11478481378318722 -0.5657845572845066```