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Suppose you want to use a Half-Angle Identity to find the exact value of the following expression. cos 67.5 OA. lo 1+ cos cos

Suppose you want to use a Half-Angle Identity to find the exact value of the following expression. cos 67.5 OA. lo 1+ cos cos 67.5 = 2 O B. 1 - cos cos 67.5 = - 2 C. 1 + cos cos 67.5 = - 1 2 OD. 1- cos 2-2 cos 67.5 = 2

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