Excel Function : IMCOS
Returns the cosine of a complex number
Microsoft Excel Reference Page
Syntax and Description of the IMCOS Excel Function
The IMCOS function in Excel returns the inverse cosine of a number, in radians. The syntax of the function is as follows: =IMCOS(number) where "number" is the number for which you want to find the inverse cosine.
About IMCOS Excel Function
IMCOS function in excel returns the inverse cosine of a number. The inverse cosine is the angle whose cosine is a given number, and is the return value of the ACOS function. The number must be between -1 and 1.