This is part of my assignment please help

Again, this utilityfunction reflects the sharp discount between the new cur- rent period (i.e., period two) and the new tomorrow (i.e., period three). Finally, at time t = 3 the agent has the following utility function: In ca- a. Prove that if / = 1, then the utility function at t = 2 is a linear trans- formation of the last two terms of the utility function at t = 1. Prove that if /