Is this right? So I figure this as (I'm not sure if my working here is flawed or not) And I also did it via substitution and got the same answer. I googled though and there are a few different answers....none of them mine.
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Heres some working of the problem derive cos^(-1)(cos(x)) - Wolfram|Alpha
Ok I see where I went wrong in my my substitution working. So
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