# Python | Numpy np.chebder() method

With the help of `np.chebder()` method, we can get the differentiated value of chebyshev series in the form of an array having value of coordinates using `np.chebder()` method.

Syntax : `np.chebder(series, value)`
Return : Return an array having coordinates of series after differentiation.

Example #1 :
In this example we can see that by using `np.chebder()` method, we are able to get the differentiation of chebyshev series and it will return an array having coordinates of it.

 `# import numpy ` `import` `numpy as np ` `from` `numpy.polynomial ``import` `chebyshev as C ` ` `  `x ``=` `np.array([``1``, ``2``, ``3``]) ` `# using np.chebder() method ` `gfg ``=` `C.chebder(x, ``2``) ` ` `  `print``(gfg) `

Output :

```[ 12.]
```

Example #2 :

 `# import numpy ` `import` `numpy as np ` `from` `numpy.polynomial ``import` `chebyshev as C ` ` `  `x ``=` `np.array([``2``, ``5``, ``7``, ``11``]) ` `# using np.chebder() method ` `gfg ``=` `C.chebder(x, ``2``) ` ` `  `print``(gfg) `

Output :

```[  28.  264.]
```
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