6th Year Maths Homework

Homework Correction and Notes: https://www.dropbox.com/s/kj50i1ik7iv836t/HW%20%26%20Notes%2016.12.12.jpg?dl=0

Use de Moivre to prove that:
Cos2A = Cos2A-Sin2A
Sin2A = 2SinA CosA

p.327 q.9 i,ii
Remember that 1/(zn) = z-n

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