Hi MHF,

There are two questions that are confusing me. I understand the material, but when I was working them out, I would get stuck (with algebra parts) and I do not know how to continue.

a) Find y'' by implicit differentiation.

I found y'=

(that's supposed to be a fraction)

What is y''?

b) If f = cot , find f'''( )

f'(x) =

What is f"? f"'?

Thank you very much!