Excel COS function
Description
The COS function returns the cosine of an angle given in radians.
Syntax and arguments
Formula syntax
=COS(number) 
Arguments

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:
=COS(angle_radians)
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:
=COS(RADIAN(angle_degrees)
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
=COS(RADIANS(30))
Or you can use the formula
=COS(30*PI()/180)
Download Sample File
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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