I've always had a hard time with differentiation. Always. Product rules, quotient rules, chain rules, too confusing. Anyway, enough of my complaining. Let me post my problem. Differentiate: y=ln((x^3*tanx)/sq root(5x^2+3x-7)) I got some horribly long answer (which was wrong, I won't even post it, it's too absurd) and I'm wondering what I did wrong. I know I need to use the quotient rule, but how does the ln fit into that? Help would be appreciated.