C++ Math sin

The function is used to find the sine of an angle given in radian.

Syntax

Consider a radian 'x'. Syntax would be:

float sin(float x);
float sin(double x);
float sin(long double x);
double sin(integral x);

Note: If the value passed is an integer type, then it is cast to double.

Parameter

x : The value specified in terms of radian.

Return value

It returns the sine of an angle given in radian in the range[-1,1].

Example 1

Let's see a simple example when the value of x is positive.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
  double degree=60;
  double radian=degree*3.14/180;
  cout<<"Sine of an angle is : "<<sin(radian);
  return 0;
}

Output:

Sine of an angle is : 0.86576

In this example, sin function calculates the sine of an angle when the degree is equal to 60.

Example 2

Let's see a simple example when the value of x is negative.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
  double degree= -50;
  double radian=degree*3.14/180;
  cout<<"Sine of an angle is : "<<sin(radian);
  return 0;
}

Output:

Sine of an angle is : -0.76576

In his example, sin function finds the sine of an angle when the value of degree is negative i.e -50.