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What does cis^-1 (x) mean

like you know how there is sin^-1 (x) and sin(x) applying that concept with cis(x) what does that mean?

Note that is not a spelling mistake I'm not trying to say cos^-1 (x) I'm indeed saying cis^-1 (x) with an "i"

I also wander what does cis stand for like cos is cosine sin is sine etc. how do I say cis...

like I was thinking ok

cis(x) = cos(x) + i sin(x) = e^(ix)

what does cis^-1(x) mean

kind of stuck here...

Thank You

2. Relevant equations

3. The attempt at a solution

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