## Excel COS function

### Description

The COS function returns the cosine of an angle given in radians.

### Syntax and arguments

Formula syntax

 =COS(number)

Arguments

 Number: Required. The angle in radians whose cosine value you want to calculate.

Return Value

The ABS function returns a cosine value (numeric value).

Notes:

1. The (number) argument is the angle in radians.

2. if the (number) argument is the angle in degree, either multiple the PI()/180 or use the RADIANS function to convert the angle to radians. I.e. Calculate the cosine value of degree 60, use this formula =COS(RADIANS(60)) or =COS(60*PI()/180).

### Usage and Examples

Here list the basic usages of COS function in your daily work.

Example 1- Calculate the cosine value of a given angle in radians

Formula syntax:

Arguments:

Angle_radians: the angle in radians you want to calculate its cosine value.

Supposing the given angle of radian is 1.245, you can use this formula

=COS(1.245)

Example 2- Calculate the cosine value of a given angle in degrees

Formula syntax:

Or
=COS(angle_degrees *PI()/180)

Arguments:

Angle_degrees: the angle in degrees that you want to calculate its cosine value.

Supposing the given angle in degrees is 30, you can use this formula

Or you can use the formula

=COS(30*PI()/180)

#### Relative Functions

• Excel ASIN Function
The ASIN function calculates the arcsine of a give number, and returns an angle which is in radians between -π/2 and π/2.

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