# Java Math cos() method with Examples

The java.lang.Math.cos() returns the trigonometric cosine of an angle. If the argument is NaN or an infinity, then the result returned is NaN. The returned value will be in range [-1, 1].

Syntax :

```public static double cos(double angle)
Parameters:
The function has one mandatory parameter angle which is in radians.
```

Returns :
The function returns the trigonometric cosine of an angle.

Example 1 : To show working of java.lang.Math.cos() method.

 `// Java program to demonstrate working ` `// of java.lang.Math.cos() method ` `import` `java.lang.Math; ` ` `  `class` `Gfg { ` ` `  `    ``// driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` `        ``double` `a = ``30``; ` `         `  `        ``// converting values to radians ` `        ``double` `b = Math.toRadians(a); ` ` `  `        ``System.out.println(Math.cos(b)); ` ` `  `        ``a = ``45``; ` `         `  `        ``// converting values to radians ` `        ``b = Math.toRadians(a); ` ` `  `        ``System.out.println(Math.cos(b)); ` ` `  `        ``a = ``60``; ` `         `  `        ``// converting values to radians ` `        ``b = Math.toRadians(a); ` ` `  `        ``System.out.println(Math.cos(b)); ` ` `  `        ``a = ``0``; ` `         `  `        ``// converting values to radians ` `        ``b = Math.toRadians(a); ` ` `  `        ``System.out.println(Math.cos(b)); ` `    ``} ` `} `

Output:

```0.8660254037844387
0.7071067811865476
0.5000000000000001
1.0
```

Example 2 : To show working of java.lang.Math.cos() method when argument is NAN or infinity.

 `// Java program to demonstrate working ` `// of java.lang.Math.cos() method infinity case ` `import` `java.lang.Math; ``// importing java.lang package ` ` `  `public` `class` `GFG { ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` ` `  `        ``double` `positiveInfinity =  ` `               ``Double.POSITIVE_INFINITY; ` `        ``double` `negativeInfinity =  ` `               ``Double.NEGATIVE_INFINITY; ` `        ``double` `nan = Double.NaN; ` `        ``double` `result; ` ` `  `        ``// Here argument is negative infinity,  ` `        ``// output will be NaN ` `        ``result = Math.cos(negativeInfinity); ` `        ``System.out.println(result); ` ` `  `        ``// Here argument is positive infinity,  ` `        ``// output will also be NaN ` `        ``result = Math.cos(positiveInfinity); ` `        ``System.out.println(result); ` ` `  `        ``// Here argument is NaN, output will be NaN ` `        ``result = Math.cos(nan); ` `        ``System.out.println(result); ` `    ``} ` `} `

Output:

```NaN
NaN
NaN
```

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