# sympy.integrals.transforms.cosine_transform() in python

• Last Updated : 10 Jul, 2020

With the help of cosine_transform() method, we can compute the cosine transformation and return the transformed function by using this method.

cosine transformation

Syntax : cosine_transform(f, x, k, **hints)

Return : Return the transformed function.

Example #1 :

In this example we can see that by using cosine_transform() method, we are able to compute the cosine transformation and return the transformed function.

## Python3

 `# import cosine_transform``from` `sympy ``import` `cosine_transform, exp, sqrt, cos``from` `sympy.abc ``import` `x, k, a`` ` `# Using cosine_transform() method``gfg ``=` `cosine_transform(exp(``-``a ``*` `x), x, k)`` ` `print``(gfg)`

Output :

sqrt(2)*a/(sqrt(pi)*(a**2 + k**2))

Example #2 :

## Python3

 `# import cosine_transform``from` `sympy ``import` `cosine_transform, exp, sqrt, cos``from` `sympy.abc ``import` `x, k, a`` ` `# Using cosine_transform() method``gfg ``=` `cosine_transform(exp(``-``a ``*` `x), x, ``5``)`` ` `print``(gfg)`

Output :

sqrt(2)*a/(sqrt(pi)*(a**2 + 25))

My Personal Notes arrow_drop_up