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Using the Double angle formula and the fact cos x=cos NIX + N X (a) prove that cos X 1 + Cos x = for

Using the Double angle formula and the fact cos x=cos NIX + N X (a) prove that cos X 1 + Cos x = for Ozx590. 2 2 (b) find the value of cos 22.5 in exact by using the result in (a)

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