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# Fp3 integration question Watch

1. http://www.ocr.org.uk/Images/64993-q...hematics-3.pdf

Question 4. I get a bit stuck on simplifying:

how does the simplify down to it's the -i part i don't get.
2. (Original post by Music99)
http://www.ocr.org.uk/Images/64993-q...hematics-3.pdf

Question 4. I get a bit stuck on simplifying:

how does the simplify down to it's the -i part i don't get.
3. (Original post by Mr M)
Ahh of course thanks!
4. Because when you multiply out the brackets you get e^(3ipi/2 + pi) then you use rules of indices to get e^3ipi/2 x e^pi and e^3ipi/2 is the same as -i hope that makes sense I'm awful at explaining! I did aqa and this was part of fp2 for us

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