How to put y=4cos(x) in X= form?

How to put y=4cos(x) in X= form?

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\[x=\cos^{-1} (y/4)\]

It is only allowed in said domain in order to make it the inverse function (It needs to pass the horizontal line test)

Inverse y = 4cos(x) x/4 = 4cos(x)/4 y/4 = cos(x) take inverse of each side arccos(y/4) = arccos(cos(x)) arccos(y/4) = 1x arccos(y/4) = x Remember that arccos is the inverse function of cos(x) and is limited to the domain [0, pi]

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