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Some FP2 Help Please [MEI] watch

1. I completely do not understand part i) and ii). How did they draw that conclusion? Im completely lost.
2. Part i) Have you written out a few terms of C+iS?

Part ii) Double angle formulae.
3. for part i I have, 1 + (n1)e^jtheta + (n2)e^2jtheta etc
4. and so you have

5. (Original post by BabyMaths)
and so you have

ahh, im not sure how that becomes (i+e^jtheta)^n though =/
6. (Original post by TimetoSucceed)
ahh, im not sure how that becomes (1+e^jtheta)^n though =/
Expand then.

It should become clear.
7. If you expand that wouldn't you just get 1+e^jntheta, im finding this very difficult
8. maybe the (n 1), (n 2) part is confusing me, ive always been quite confused on questions like these =/
9. (Original post by TimetoSucceed)
If you expand that wouldn't you just get 1+e^jntheta, im finding this very difficult
No. You should review the binomial expansion.
10. (Original post by TimetoSucceed)
If you expand that wouldn't you just get 1+e^jntheta, im finding this very difficult
No - what does the binomial theorem tell you about the expansion of ?

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