# Pedro123's latest activity

• I'm not sure how right the answers are, seeing as it says 2 for 10 (MCQ) when it's 3, so dw. I haven't checked the other ones though
• Pedro123 replied to the thread What is this technique??.
Personification?
• Does anyone have any suggestions for resources available to use Fahrenheit 451 as a related text for 1984? Also, for people who did...
• Pedro123 reacted to Trebla's post in the thread De Moivre's Theorem with Like.
Just expand the RHS using compound angles and it works out. You actually don't even need to memorise this because it's in the reference...
• Pedro123 replied to the thread De Moivre's Theorem.
Thanks guys - turns out I just pulled a bit of a dumb :) Out of curiosity, does anyone have any ideas to prove the sum of cosine...
• Pedro123 reacted to B1andB2's post in the thread De Moivre's Theorem with Like.
This is what I’ve been doing I don’t know how to finish off the last line, but most of it is there Sorry it’s so messy also just...
• Pedro123 reacted to Trebla's post in the thread De Moivre's Theorem with Like.
As a hint 1+\cos\theta-i\sin\theta = 2\cos^2\frac{\theta}{2}-2i\sin\frac{\theta}{2}\cos\frac{\theta}{2} =...
• Not sure how to solve the following: (1+cos(a)+isin(a))^k+(1+cos(a)-isin(a))^k = (2^k*2)*cos(ka/2)cos^k(a/2) I can get it down to...