# Inverse Sine in Python In Python, one can perform many kinds of tasks including mathematical operations like add, subtract, divide, dealing with matrices, etc. Besides all these operations, one can also perform complex mathematical operations like dealing with sets and matrices, trigonometric operations using many libraries and modules provided by Python.

In this tutorial, we will see how to find out the inverse sine in Python.

## Use the `numpy.arcsin` Function of the `NumPy` Library

The `NumPy` library is a widely used library in Python. This library helps in dealing with arrays, matrices, linear algebra, and Fourier transform. `NumPy` stands for `Numerical Python`.

The `NumPy` has a function known as the `arcsin()` function that is a mathematical function used to calculate the inverse sine of elements in an array.

### Some Parameters of the `numpy.arcsin()` function

• `x (array)` – This parameter defines the input array of which the inverse sine values are to be found.
• `out (array, None, or tuple)` – This parameter defines the location in which the result is stored. If this parameter is not defined then the result is returned in a new array.

There are many other parameters like `where (array)`, `casting`, `order`, etc. Also, note that only the `x (array)` parameter is necessary to define. All the other parameters are optional.

Example:

Output:

Input Array : [-1, 0, 0.3, 0.6, 1] Inverse Sine values : [-1.57079633 0. 0.30469265 0.64350111 1.57079633]

### Graphical Representation of the `numpy.arcsin()` function.

In this program, the `Matplotlib` library is used to plot the graph. This library is a very good library when it comes to data visualisation in python.

In the program below, the `linspace()` function of the `NumPy` is used. The `linspace()` function helps in creating a random numerical sequence that are evenly spaced.

Output:

input_array : [-3.14159265 -2.6927937 -2.24399475 -1.7951958 -1.34639685 -0.8975979
-0.44879895 0. 0.44879895 0.8975979 1.34639685 1.7951958
2.24399475 2.6927937 3.14159265] output_array with arcsin : [ nan nan nan nan nan -1.11428969
-0.46542088 0. 0.46542088 1.11428969 nan nan
nan nan nan] ## Use the `math.asin()` Function of the `Math` Library

Python’s `Math` library helps in performing complex mathematical problems by providing different mathematical constants and functions in Python.

The `asin()` function of the `Math` library is also used for calculating the inverse sine value (between -1 to 1) of a given input value in Python.

Example:

Output:

-1.5707963267948966
0.0
0.30469265401539747
0.6435011087932844
1.5707963267948966

## Use the `sympy.asin()` Function of the `SymPy` Library

Python’s `SymPy` library is used in symbolic mathematics. It is a Computer Algebra System (CAS) that provides short and precise codes that can be used easily by the user.

The `asin()` function of the `SymPy` library is also used for calculating the inverse sine value of a given input value in Python.

Example:

Output:

pi/2

That’s all about how to get inverse sine in Python.

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