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# What is sin() in C? 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.   The sin() function in C returns the sine of a number. To be more specific, it returns the sine of a number in the radians float value.

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

Mathematical representation of the sin() function

Note:

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

## Syntax

double sin(double 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 (radians float value) that is sent as a parameter.

## Example

#include<stdio.h>
#include<math.h>

int main() {
//positive number in radians
printf("The sine of %lf is %lf \n", 2.3, sin(2.3));

// negative number in radians
printf("The sine of %lf is %lf \n", -2.3, sin(-2.3));

//converting the degrees angle into radians and then applying sin()
// degrees = 45.0
// PI = 3.14159265
// result first converts degrees to radians then apply sin
double result=sin(45.0 * (3.14159265 / 180.0));
printf("The sine of %lf is %lf \n", 45.0, 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.   Keep Exploring

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