Need a bit of help with 1 c... (ignore the blue underline)
I've got a means of solving i, ii, and iii partially but i'm not sure if it's the best approach.
Considering 1a and 1c(i) look fairly similar...
Where it asks to to solve for 8x^4-8x^2+1 = 0
I made cos4\theta = 0
This gave me 4\theta...