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# Python | math.sin() function

• Last Updated : 20 Mar, 2019

In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. `math.sin()` function returns the sine of value passed as argument. The value passed in this function should be in radians.

Syntax: math.sin(x)

Parameter:
x : value to be passed to sin()

Returns: Returns the sine of value passed as argument

Code #1:

 `# Python code to demonstrate the working of sin()``    ` `# importing "math" for mathematical operations ``import` `math ``   ` `a ``=` `math.pi ``/` `6``    ` `# returning the value of sine of pi / 6 ``print` `(``"The value of sine of pi / 6 is : "``, end ``=``"") ``print` `(math.sin(a)) `
Output:
```The value of sine of pi/6 is : 0.49999999999999994
```

Code #2:

 `# Python program showing ``# Graphical representation of ``# sin() function ``import` `math``import` `matplotlib.pyplot as plt `` ` `in_array ``=` `[``-``3.14159265``, ``-``2.57039399``, ``-``0.28559933``,``            ``0.28559933``, ``2.57039399``,  ``3.14159265``]`` ` `out_array ``=` `[]`` ` `for` `i ``in` `range``(``len``(in_array)):``    ``out_array.append(math.sin(in_array[i]))``    ``i ``+``=` `1`` ` `  ` `print``(``"in_array : "``, in_array) ``print``(``"\nout_array : "``, out_array) `` ` `# red for numpy.sin() ``plt.plot(in_array, out_array, color ``=` `'red'``, marker ``=` `"o"``) ``plt.title(``"math.sin()"``) ``plt.xlabel(``"X"``) ``plt.ylabel(``"Y"``) ``plt.show() `
Output:

in_array : [-3.14159265, -2.57039399, -0.28559933, 0.28559933, 2.57039399, 3.14159265]

out_array : [-3.5897930298416118e-09, -0.5406408168673427, -0.2817325547837714, 0.2817325547837714, 0.5406408168673427, 3.5897930298416118e-09]

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