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# What is math.sin() in Python? Harris Amjad

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The sin() function returns a number’srepresenting an angle sine. To be more specific, it returns the sine of a number in radians.

The illustration below shows the mathematical representation of the sin() function.

Mathematical representation of the sine function

Note:

• The math module is required for this function.
• This sin() function only works for right-angled triangles.

## Syntax

sin(num)


## Parameter

This function requires a number that represents an angle in radians as a parameter.

In order to convert degrees to radians, use the following formula:

radians = degrees * ( pi / 180.0 )


## Return value

sin() returns the sine of a number (in radians) that is sent as a parameter. The return value is in the range [-1,1].

## Code

import math

#positive number in radians
print "The value of sin(2.3) : ",  math.sin(2.3)

#negative number in radians
print "The value of sin(-2.3) : ",  math.sin(-2.3)

#converting the degrees angle into radians and then applying sin()
#degrees = 90
#PI = 3.14159265
result = 90.0 * (math.pi / 180.0)
print "The value of sin("+str(result)+") : ",  math.sin(result)

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CONTRIBUTOR Harris Amjad

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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