The **Math.con()** function in Javascript is used to return the cosine of a number.

The Math.cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle given in radians.

cos() is a static method of Math, therefore, it is always used as Math.cos(), rather than as a method of a Math object created.

**Syntax:**

Math.cos(value)

**Parameters Used:**

** Value:**A number given in radians.

**Return Value:**

The Math.cos() function returns the cosine of the given numbers which range from -1 to 1.

**Examples:**

**When zero is passed as a parameter.**`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write("Output : " + Math.cos(0));`

`</`

`script`

`>`

**Output:**Output : 1

**When 1 is passed as a parameter.**`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write("Output : " + Math.cos(1));`

`</`

`script`

`>`

**Output:**Output : 0.5403023058681398

**When PI is passed as a parameter.**`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write("Output : " + Math.cos(Math.PI));`

`</`

`script`

`>`

**Output:**Output : -1

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