# Python | sympy.diff() method

With the help of `sympy.diff()` method, we can find the differentiation of mathematical expressions in the form of variables by using `sympy.diff()` method.

Syntax : `sympy.diff(expression, reference variable)`
Return : Return differentiation of mathematical expression.

Example #1 :
In this example we can see that by using `sympy.diff()` method, we can find the differentiation of mathematical expression with variables. Here we use `symbols()` method also to declare a variable as symbol.

 `# import sympy ` `from` `sympy ``import` `*` `x, y ``=` `symbols(``'x y'``) ` `gfg_exp ``=` `x ``+` `y ` `exp ``=` `sympy.expand(gfg_exp``*``*``2``) ` `print``(``"Before Differentiation : {}"``.``format``(exp)) ` ` `  `# Use sympy.diff() method ` `dif ``=` `diff(exp, x) ` ` `  `print``(``"After Differentiation : {}"``.``format``(dif)) `

Output :

Before Differentiation : x**2 + 2*x*y + y**2

After Differentiation : 2*x + 2*y

Example #2 :

 `# import sympy ` `from` `sympy ``import` `*` `x, y ``=` `symbols(``'x y'``) ` `gfg_exp ``=` `sin(x)``*``cos(x) ` ` `  `print``(``"Before Differentiation : {}"``.``format``(gfg_exp)) ` ` `  `# Use sympy.diff() method ` `dif ``=` `diff(gfg_exp, x) ` ` `  `print``(``"After Differentiation : {}"``.``format``(dif)) `

Output :

Before Differentiation : sin(x)*cos(x)

After Differentiation : -sin(x)**2 + cos(x)**2

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