edexcel c3

the dx/dy question threw me, I couldn't get it terms of y at all. It was something like dx/dy = 1/sec^2(2y) then cos^2(2y). You were supposed to use the original equation y=2tan(2x) and rearrange it so x=something(y)? then put that into cos^2(2y)? I just couldn't rearrange it properly.

I wont be getting 90UMS, more like 60-70.
 
I hope the grade boundaries are low, I am only going for a B though for uni. If I can get 70ums that takes a lot of pressure off c4. I only had 2 months to do c3 and c4 so it has been a rush to learn it all.

Q1, I honestly cannot remember the numbers but it was in the form of (a+bx)/(cx+d)(ex-f)
 
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Good luck as well, how do you revise by the way? I use the exam solutions videos then do past papers with his videos to explain questions I get stuck on.
 
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