Differentiation question

Can someone please tell me how to do part a of this question?? I've tried using d/dx lnf(x) = f'(x) / f(x) but I'm stuck with (1+u) / (u+sqrt(u^2-1))(sqrt(u^2-1) ...

Reply 1

blizzardliz

Original post by blizzardliz

Can someone please tell me how to do part a of this question?? I've tried using d/dx lnf(x) = f'(x) / f(x) but I'm stuck with (1+u) / (u+sqrt(u^2-1))(sqrt(u^2-1) ...

I used the chain rule to find f'(x) as well if that's maybe the wrong thing? if anyone wants me to attach a photo of my working bc i can't really type it out let me know!

Reply 2

mqb2766

Original post by blizzardliz

Can someone please tell me how to do part a of this question?? I've tried using d/dx lnf(x) = f'(x) / f(x) but I'm stuck with (1+u) / (u+sqrt(u^2-1))(sqrt(u^2-1) ...