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# Python | sympy.rewrite() method

• Last Updated : 07 Jul, 2019

With the help of sympy.rewrite() method, we can represent any mathematical function in terms of another function.

Syntax: expression.rewrite(function)

Parameters:
expression – It is mathematical expression which is to be represented by another function.
function – It is the mathematical function used to rewrite the given expression.

Returns: Returns a mathematical expression corresponding to the input in terms of specified function.

Example #1:

 `# import sympy ``from` `sympy ``import` `*` ` ` `x ``=` `symbols(``'x'``)``expr ``=` `tan(x)``print``(``"Expression = {}"``.``format``(expr))``  ` `# Use sympy.rewrite() method ``expr_in_terms_of_sin ``=` `expr.rewrite(sin)  ``     ` `print``(``"Expression in terms of sin() : {}"``.``format``(expr_in_terms_of_sin))  `

Output:

```Expression = tan(x)
Expression in terms of sin() : 2*sin(x)**2/sin(2*x)
```

Example #2:

 `# import sympy ``from` `sympy ``import` `*` ` ` `x ``=` `symbols(``'x'``)``expr ``=` `factorial(x)``print``(``"Expression = {}"``.``format``(expr))``  ` `# Use sympy.rewrite() method ``expr_in_terms_of_gamma ``=` `expr.rewrite(gamma)  ``     ` `print``(``"Expression in terms of gamma() : {}"``.``format``(expr_in_terms_of_gamma))  `

Output:

```Expression = factorial(x)
Expression in terms of gamma() : gamma(x + 1)
```

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