FP3 june 2013 OCR (not MEI)

FP3 Jan 2013 attached,

I dont have the Mark Scheme unfortunately.

Anyone have stuff they're stuck on ?

Already posted Coolina133! On the jan 13 paper I didn't get question 7ii, I would have thought that sin(1/2theta) if theta is 2npi you'd get 0 and that therefore S would be undefined? But apparently it makes it = 10!???

That's what I thought, but then it actually says for where theta isn't 2npi :')

Stick it into the original formula with the exponentials and you get 1+1+1+...=10, took me a few minutes to realise haha.

And the exam should be fine, so long as I don't do 2-2=5 when I'm getting vector products, they're my biggest downfall

Ive done that :P. also I don't like spiral enlargements.

Sometimes on the complex numbers questions I just can't see what they want me to do after using de Moivre to get some identity, think it's more a confidence issue than anything haha

Oh I'm fine of those. It's usually just trig identities, although some of the polynomial things after are difficult!

That's what I mean, like I can get a bit confused on how they want me to get values from a polynomial, I was terrible at it at first but I'm usually fine now :')

That's what I thought, but then it actually says for where theta isn't 2npi :')

Stick it into the original formula with the exponentials and you get 1+1+1+...=10, took me a few minutes to realise haha.

And the exam should be fine, so long as I don't do 2-2=5 when I'm getting vector products, they're my biggest downfall

Hmm, I swear it says find S when theta is 2npi! although I see how the original method works, I reckon expanding it and then getting two fractions would sort it out.