# Python | sympy.expand_func() method

With the help of sympy.expand_func() method, we can expand special functions in terms of some mathematical identities.

Syntax: expand_func(expression)

Parameter:
expression – It is mathematical expression which is to expanded.

Returns: Returns a mathematical expression corresponding to the input in terms of some mathematical identities.

Example #1:

 `# import sympy  ` `from` `sympy ``import` `*`  ` `  `x ``=` `symbols(``'x'``) ` `expr ``=` `gamma(x ``+` `3``) ` `print``(``"Expression = {}"``.``format``(expr)) ` `  `  `# Use sympy.expand_func() method  ` `expand_expr ``=` `expand_func(expr)   ` `     `  `print``(``"Expanded Expression : {}"``.``format``(expand_expr))   `

Output:

```Expression = gamma(x + 3)
Expanded Expression : x*(x + 1)*(x + 2)*gamma(x)
```

Example #2:

 `# import sympy  ` `from` `sympy ``import` `*`  ` `  `x ``=` `symbols(``'x'``) ` `expr ``=` `binomial(x, ``3``) ` `print``(``"Expression = {}"``.``format``(expr)) ` `  `  `# Use sympy.expand_func() method  ` `expand_expr ``=` `expand_func(expr)   ` `     `  `print``(``"Expanded Expression : {}"``.``format``(expand_expr))   `

Output:

```Expression = binomial(x, 3)
Expanded Expression : x*(x - 2)*(x - 1)/6
```
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