I can't even join in on the 'what did you get/this is what I got' discussions because I feel I did so badly on it. Loads of questions I worked through and all was hunky dory until the final line and I'd think, "Hmmm, this doesn't look right...",
I guess I'll throw some answers out just with the off-chance I was correct...
For the cartesian equation of the parametric curve... xy+4y-4x = 0 ???? (I managed to work through to get the correct equation, but the '=0' can't be right. Maybe I did a sign error somewhere. If so, then it might be =32... or =16?) Anyway I got =0...
For the 2/15(k=root5)... k=5, but it was really odd to work out and I'll be honest, my calculator can answer in surds so I kind of jumped from one line to randomly having the answer.
For the vector question, part c, I also got each co-ordinate as being something/17.
I didn't even look at part d.
For the final question....... First part, I did integration by parts to get something like tcos(tpi/4) + 16/pi^2 sin(tpi.4)
And for the next part I used that to do the various integrations. Only problem is my '+c' came out as 256-16/pi^2, which is different to what other people got.
And then when I plugged it all back into the original equation for when t=45... I forgot to add my +c into it!!! So my final answer was negative. I then realised I'd done it wrong but only had about 15 seconds left, so instead just wrote a note saying, "argh, forgot the +c, boohoo." Haha.
To conclude:
Hardest C4 test I've ever done, by a very long shot. And I did about ten of them over the last few days.
I predict a B or C for me. Lucky for me I've done alright in everything else so far, so I'm still on track for getting an A. Woohoo. Must admit though, I was sort of getting my hopes up for an A*, but after that ordeal, no way!