[Term Entry] Python:NumPy Math Methods: .arctan() (#5653)

* [Term Entry] Python:NumPy Math Methods: .arctan()

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* Update content/numpy/concepts/math-methods/terms/arctan/arctan.md

Co-authored-by: Savi Dahegaonkar <[email protected]>

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content/numpy/concepts/math-methods/terms/arctan/arctan.md

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+---
+Title: '.arctan()'
+Description: 'Calculates the inverse tangent of the elements in an array.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'NumPy'
+  - 'Methods'
+  - 'Arrays'
+  - 'Elements'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+In NumPy, the **`.arctan()`** method calculates the inverse tangent of the elements in an [array](https://www.codecademy.com/resources/docs/numpy/ndarray) and returns a new array containing the calculated values. The values are in radians and lie in the range `-pi/2` to `pi/2`. By understanding this method, developers can effectively work with trigonometric calculations and geometric problems in NumPy.
+
+## Syntax
+
+```pseudo
+numpy.arctan(arr, out=None, where=True)
+```
+
+- `arr`: The array whose inverse tangent is to be calculated.
+- `out`: The array to be used for storing the result. If not provided or set to `None`, a new array is returned.
+- `where`: A boolean array or condition that specifies the elements for which the inverse tangent is to be calculated. If not provided, it defaults to `True` for all the elements.
+  - If the condition is `True` for a specific element, the inverse tangent of that element is calculated.
+  - If the condition is `False` for a particular element, that element remains unchanged.
+
+## Example
+
+The following example demonstrates the usage of the `.arctan()` method:
+
+```py
+import numpy as np
+
+# Creating an array
+arr = np.array([0, 1, 2, -1, -2])
+
+# Calculating the inverse tangent of the elements in the array
+res = np.arctan(arr)
+
+print(res)
+```
+
+The above code produces the following output:
+
+```shell
+[ 0.          0.78539816  1.10714872 -0.78539816 -1.10714872]
+```
+
+## Codebyte Example
+
+The following codebyte example shows the use of the `.arctan()` method:
+
+```codebyte/python
+import numpy as np
+
+# Creating an array
+arr = np.array([10, 11, 12, -11, -12])
+
+# Calculating the inverse tangent of the elements in the array
+res = np.arctan(arr)
+
+print(res)
+```