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Python | sympy.subs() method
• Last Updated : 12 Jun, 2019

With the help of `sympy.subs()` method, we can substitute the value of variables in the various mathematical functions by using the `sympy.subs()` method.

Syntax : `sympy.subs(source, destination)`
Return : Return the same expression by changing the variable.

Example #1 :

In this example we can see that by using the `sympy.subs()` method, we can substitute the value of existing variable to the new variable.

 `# import sympy``from` `sympy ``import` `*`` ` `# symbol declaration``x, y ``=` `symbols(``'x y'``)`` ` `gfg_exp ``=` `cos(x) ``+` `1`` ` `# use the method sympy.subs()``gfg_exp ``=` `gfg_exp.subs(x, y)`` ` `print``(gfg_exp)`

Output :

cos(y) + 1

Example #2 :

 `# import sympy``from` `sympy ``import` `*`` ` `# symbol declaration``x, y ``=` `symbols(``'x y'``)`` ` `gfg_exp ``=` `cos(x) ``+` `1`` ` `# use the method sympy.subs()``gfg_exp ``=` `gfg_exp.subs(x, ``0``)`` ` `print``(gfg_exp)`

Output :

2

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