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Python | sympy.replace() method
• Last Updated : 26 Jul, 2019

With the help of `sympy.replace()` method, we can replace the functions in the mathematical expression without editing the whole expression by using `sympy.replace()` method.

Syntax : `sympy.replace()`
Return : Return the replaced values in the mathematical expression.

Example #1 :
In this example we can see that by using `sympy.replace()` method, we are able to replace the mathematical functions in the expression and return the updated expression.

 `# import sympy``from` `sympy ``import` `*` ` ` `x, y ``=` `symbols(``'x y'``)`` ` `f ``=` `sin(x) ``+` `cos(``2` `*` `x)`` ` `# Use sympy.replace() method``gfg ``=` `f.replace(cos, sin)``    ` `print``(gfg)`

Output :

sin(x) + sin(2*x)

Example #2 :

 `# import sympy``from` `sympy ``import` `*` ` ` `x, y ``=` `symbols(``'x y'``)`` ` `f ``=` `log(sin(x)) ``+` `tan(cos(``2` `*` `x))``# Use sympy.replace() method``gfg ``=` `f.replace(log, tan)``    ` `print``(gfg)`

Output :

tan(sin(x)) + tan(cos(2*x))

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