For the simple right-angled triangle below, the cosine of the angle θ, is the ratio of the adjacent side, a, to the hypotenuse, h.The trig. ratios are discussed further on the Wikipedia Trigonometric Ratios Page
The Excel COS function calculates the cosine of a given angle.
The syntax of the function is:
Converting from Radians to Degrees
If your angle is in degrees, you will need to convert it into radians before supplying it to the Cos function.An example of this is given below.
The following spreadsheet shows the Excel Cos Function, used to calculate the cosine of four different angles.
Note that in the above examples:
For further information and examples of the Excel Cos function, see the Microsoft Office website.