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(7) Suppose cos 0 = and -7 6 and T 0 < 0. Calculate each of the following. (7) Suppose cos O (a) cos (b)

(7) Suppose cos 0 = and -7

6 and T 0 < 0. Calculate each of the following. (7) Suppose cos O (a) cos (b) cos2 [hint: Use a double angle formula.]

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