# Python | sympy.rewrite() method

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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