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C++ Math asin()

The function computes the inverse sine of a number given in radian.

asin(x) = sin^-1x

Syntax

Suppose a number is 'x'. Syntax would be:

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

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

Parameter

x: The value whose inverse sine is to be calculated

Return value

Parameter	Return value
-1≤x≤1	-∏/2,∏/2
x<-1 or x>1	Not a Number

Example 1

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

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float degree=0;
    float x=degree*3.14/180;
    std::cout << "Value of Sine is :" <<sin(x)<< std::endl;
    cout<<"Inverse of Sine is :"<<asin(x);
    return 0;
}

Output:

Value of Sine is :0
Inverse of Sine is :0

In this example, asin() function calculates the inverse sine of a number when the value of x is zero.

Example 2

Let's see a simple example when the value of x is greater than 1.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float degree=90;
    float x=degree*3.14/180;
    std::cout << "Value of Sine is :" <<sin(x)<< std::endl;
    cout<<"Inverse of Sine is :"<<asin(x);
    return 0;
}

Output:

Value of Sine is :1
Inverse of Sine is :nan

In this example, asin() function calculates the inverse sine of a number when the value of x is greater than 1.

Example 3

Let's see a simple example when the value of x is less than -1.

#include <iostream>
#include<math.h>
using namespace std;
int main()
{
    float degree= -78;
    float x=degree*3.14/180;
    std::cout << "Value of Sine is : " <<sin(x)<< std::endl;
    cout<<"Inverse of Sine is :"<<asin(x);
    return 0;
}

Output:

Value of Sine is : -0.978004
Inverse of Sine is :nan

In this example, asin() function calculates the inverse sine of a number when the value of x is less than -1.

Next TopicC++ Math Functions

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