Hi all ----
I actually get part (ii) of this question - but I'm just curious - how can I formally prove the symmetry? The question doesn't ask this but I'm just curious. The green box is the solution.
Part (ii) --- I can see that reaches maximum when .
But it also looks like is symmetric about . How would I prove this?
I know how to do this for ---
is symmetric about because so .
Thanks a lot ---