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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- Aug 14th 2011, 09:51 PMrushtonDerivative question.
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. - Aug 14th 2011, 09:56 PMpickslidesRe: Derivative question.
Heres some working of the problem

derive cos^(-1)(cos(x)) - Wolfram|Alpha - Aug 14th 2011, 10:15 PMrushtonRe: Derivative question.
Ok I see where I went wrong in my my substitution working.

So