The syntax of the sin()
method is:
Math.sin(double angle)
Here, sin()
is a static method. Hence, we are accessing the method using the class name, Math
.
sin() Parameters
The sin()
method takes a single parameter.
- angle - angle whose trigonometric sine is to be returned
Note: The value of the angle is in radians.
sin() Return Value
- returns the trigonometric sine of the specified angle
- returns NaN if the specified angle is NaN or infinity
Note: If the argument is zero, then the result of the sin()
method is also zero with the same sign as the argument.
Example 1: Java Math sin()
import java.lang.Math;
class Main {
public static void main(String[] args) {
// create variable in Degree
double a = 30;
double b = 45;
// convert to radians
a = Math.toRadians(a);
b = Math.toRadians(b);
// print the sine value
System.out.println(Math.sin(a)); // 0.49999999999999994
System.out.println(Math.sin(b)); // 0.7071067811865475
// sin() with 0 as its argument
System.out.println(Math.sin(0.0)); // 0.0
}
}
In the above example, we have imported the java.lang.Math
package. It is a good practice to import the package. Notice the expression,
Math.sin(a)
Here, we have directly used the class name to call the method. It is because sin()
is a static method.
Note: We have used the Java Math.toRadians() method to convert all the values into radians. It is because as per the official Java documentation, the sin()
method takes the parameter as radians.
Example 2: Math sin() Returns NaN
import java.lang.Math;
class Main {
public static void main(String[] args) {
// create variable
// square root of negative number
// results in not a number (NaN)
double a = Math.sqrt(-5);
// Using Double to implement infinity
double infinity = Double.POSITIVE_INFINITY;
// print the sine value
System.out.println(Math.sin(a)); // NaN
System.out.println(Math.sin(infinity)); // NaN
}
}
Here, we have created a variable named a.
- Math.sin(a) - returns NaN because square root of a negative number (-5) is not a number
The Double.POSITIVE_INFINITY
is a field of Double
class. It is used to implement infinity in Java.
Note: We have used the Java Math.sqrt() method to compute the square root of a number.