Using De Moivre's Theorm, express in terms of .
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Originally Posted by rednest Using De Moivre's Theorm, express in terms of . De Moivre's theorem tells us that: Now I will write for , for and for . Then expanding the left hand side and equating real and imaginary parts we get: and: . Therefore: . Now on the right divide top and bottom through by and you are done RonL
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