Problem with derivative I would be really grateful if anyone could help me with this derivative: OK, I believe I need to use the quotient rule, and I'll get something like that: but I don't know what to do next... 
Re: Problem with derivative Updated my previous post :) 
Re: Problem with derivative Quote:
Now, from trigonometry, we ought to know that: The real question is this... do you know how to find the derivative of an inverse function? Follow this procedure for any arbitrary inverse function... Suppose Then by definition of an inverse function Find the derivative: utilizing both chain rule and implicit differentiation. Solve for y': Plug in your function y in terms of x: There... thats all you need to know for an arbitrary f(x)... you can find the derivative of any f^1. Given that in your problem , we know that and therefore Refer back to your original problem: Remembering your chain rules You have to look back at good old trigonometry yet again... and so Plugging in: This problem is boring me. I will quit now. 
Re: Problem with derivative Thanks man :) I really appreciate that. 
Re: Problem with derivative Quote:
d/dx ( u / v) = (u' * v  u * v') / v^2 
Re: Problem with derivative Quote:

Re: Problem with derivative Don't worry man, nothing happened :) I changed the signs. 
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