Math Help - Need help differentiating

1. Need help differentiating

Alright folks. I just cant work out how to do this question. I think it involves differentiating. If anyone could point me in the right direction that'd be great.

Cheers.

2. Originally Posted by john1990

Alright folks. I just cant work out how to do this question. I think it involves differentiating. If anyone could point me in the right direction that'd be great.

Cheers.
You need to show that the proposed solution satisfies the given initial conditions and the recursion equation. No differentiation involved.

CB