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# What is Math.cos() in Java? Tarun Telang

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.   Java has a built-in Math class, defined in the java.lang package, which contains important functions to perform basic mathematical operations. The class has the cos() method, which is used to compute a specified angle’s trigonometric cosine.

## Syntax

public  static double cos(double angle);


## Parameters

• angle represents the double value, corresponding to the angle in radians, of which we have to find the cosine.

## Return value

• The function returns the double value corresponding to the trigonometric cosine of the angle.

If the value of angle is infinity or NaNnot a number, then the returned value is NaN.

## Code

To convert an angle measured in degrees to an equivalent angle measured in radians, we can use the built-in method Math.toRadians(double angle_in_degrees).

import java.lang.Math;class HelloWorld {    public static void main( String args[] ) {        double param = Math.toRadians(30);        double result = Math.cos(param);        System.out.println("cos(" + param + ") = " + result);                param = Math.toRadians(45);        result = Math.cos(param);        System.out.println("cos(" + param + ") = " + result);        param = Math.toRadians(60);        result = Math.cos(param);        System.out.println("cos(" + param + ") = " + result);                param = Math.toRadians(90);        result = Math.cos(param);        System.out.println("cos(" + param + ") = " + result);        result = Math.sin(Double.POSITIVE_INFINITY);        System.out.println("cos(∞) = " + result);        result = Math.sin(Double.NaN);        System.out.println("cos(NaN) = " + result);    }}
Example code for Math.cos() in java

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CONTRIBUTOR Tarun Telang

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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