# Python – math.atan() function

• Last Updated : 28 May, 2020

Math module contains a number of functions which is used for mathematical operations. The math.atan() function returns the arctangent of a number as a value. The value passed in this function should be between -PI/2 and PI/2 radians.

Syntax: math.atan(x)

Parameter:This method accepts only single parameters.

• x :This parameter is the value to be passed to atan()

Returns:This function returns the arctangent of a number as a value.

Below examples illustrate the use of above function:

Example 1:

 `# Python code to implement``# the atan()function`` ` `# importing "math"``# for mathematical operations  ``import` `math   ``     ` `a ``=` `math.pi ``/` `6``      ` `# returning the value of arctangent  of pi / 6  ``print` `(``"The value of tangent of pi / 6 is : "``, end ``=``"")  ``print` `(math.atan(a))  `

Output:

```The value of tangent of pi / 6 is : 0.48234790710102493
```

Example 2:

 `# Python code to implement``# the atan()function``import` `math ``import` `numpy as np ``import` `matplotlib.pyplot as plt  ``    ` `in_array ``=` `np.linspace(``0``, np.pi, ``10``)  ``    ` `out_array ``=` `[] ``    ` `for` `i ``in` `range``(``len``(in_array)): ``    ``out_array.append(math.atan(in_array[i])) ``    ``i ``+``=` `1``       ` `print``(``"Input_Array : \n"``, in_array)  ``print``(``"\nOutput_Array : \n"``, out_array)   ``  ` `plt.plot(in_array, out_array, ``"go:"``)  ``plt.title(``"math.atan()"``)  ``plt.xlabel(``"X"``)  ``plt.ylabel(``"Y"``)  ``plt.show()  `

Output:

```Input_Array :
[0.         0.34906585 0.6981317  1.04719755 1.3962634  1.74532925
2.0943951  2.44346095 2.7925268  3.14159265]

Output_Array :
[0.0, 0.3358423725664079, 0.6094709714274295, 0.808448792630022, 0.9492822422213403, 1.0504981725497873, 1.1253388328842984, 1.1823365638628716, 1.2269249964859286, 1.2626272556789118]
```

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