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it is 1 divided by the function
1-2 is not a function because there is no defined function, such as f(n)=0n+1-2. Also, it does not contain a variable.
The inverse of the cosine function is arcosine. The domain is −1 ≤ x ≤ 1 since the range of the cosine function is from -1 to 1. The range is from 0 to pi radians or 0 to 180 degrees.
I was not aware that the cosine function was in fashion!The range, on the other hand, is [-1, 1].
The frequency of a periodic function is 1/Period