May 9, 2021

# How to use the Excel COS function

COS Excel function is an inbuilt trigonometric function in excel which is used to calculate the cosine value of given number or in terms or trigonometry the cosine value of a given angle, here the angle is a number in excel and this function takes only a single argument which is the input number provided.

Syntax: =COS (number)

The COS function syntax has the following arguments:

• number – an angle in radians for which we want the cosine
• If an angle is given in degrees, convert it to radians by using the RADIANS function or multiplying the angle by PI()/180

Example: Let’s look at some Excel COS function examples and explore how to use the COS function as a worksheet function in Microsoft Excel:

Syntax:  =COS(I65)

Result:

Based on the Excel spreadsheet above, the following COS examples would return:

Syntax: =COS(I66)
Result: 0.965873885

Syntax: =COS(I67)
Result: 0.877582562

Syntax: =COS(I68)
Result: 0.808027508

Syntax: =COS(I69)
Result: 0.540302306

Syntax: =COS(I70)
Result: 0.070737202

Syntax: =COS(I71)
Result: -0.079120889

Syntax: =COS(I72)
Result: -0.416146837

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