Alright, so for myself:
Q1 - not sure if I showed it didn't hold for n=4 convincingly and left my answer for (ii)(b) as ((7^7 +)^3 + 7's)((7^7 + 1)^3 - 7's) so probably dropped 3 or so marks here. 17/20
Q2 - full. 19/20
Q3 - didn't realise sin(-4) was negative, so probs cut a mark here. 18/20
Q4 - did some weird stuff? I differentiate first bit correctly, managed to get up to v/sqrt(v^2 + 1) = kx + c where v = f ' (x) by using the first part and then re-arranged for sqrt(v^2 + 1), cubed it to get (v^2 +1)^(3/2) and then plugged it back into the original equation to get f '' (x) / v^3 = k / (kx+c)^3 and then integrated both sides.
Not sure how much to give myself for that? 10 marks?
Q10 - full except that for showing e < 1/3, I made a teeny slip, so cut a mark. 19/20
Q11 - did the first bit about getting the equation, found the maximum value via differentiation, plugged it back into the formula but along the way miscopied from one line to the next and hence didn't get a correct quadratic. (solved the incorrect quadratic as well) but then moved on and got the distance at the last part to be h/cos 2alpha but couldn't plug in my cos 2alpha since I'd got the incorrect version.
How much should this get? 11 marks?
That totals 94... a middling 1.