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P3 Help!! Urgent!!

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I've got a few doubts, and the marking schemes are as useless in explaining as my brain is.
Please explain well, and I'm not stupid so you don't have to write every single thing if its too much :)

1) November 06 Q5 (i) & (ii)
2) November 06 Q9 (iv)
3) June 10 p31 Q9
4) june 10 p32 Q 8 (i)
5) november p33 Q4 Q10 (ii) (b)

Also, how to draw a sec2x, how is it different than secx
And finally, how to integrate cos^3 4x I COMPLETELY forgot!!!!

THANK YOU SO MUCH!!
 
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