Hey, I've been working through some proof by induction problems, and most of them are manageable, but then I saw one which involved differentiation which I have no idea what to do. Could someone please lead me in the right direction?

I have the basic steps done:

Step 1:Prove for n = 1

Step 2:Assume for n = k

Step 3:Prove for n = k+1

I know how to start this, but how do I continue?

Thanks in advance for help. BG