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Oh you're helpful.

It might look more familiar if you rationalize.

Isn't this site meant for people who are having trouble to get help from other people?

Calm down and be rational. See what i did there?

cos-1(A) = B is equivalent to saying
A = cos(B)

so if cos-1(1/sqrt(2)) = B means
1/sqrt(2) = cos(B)
Does that help at all ?