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Find the value of cos 5 + cos 9 + 2 cos cos 13 + .2 2 ..+ cos 81 + cos- 85 .

Find the value of cos 5 + cos 9 + 2 cos cos 13 + .2 2 ..+ cos 81 + cos- 85 . 2 A 23/2 B 21/2 c 25/2 D 21 Q.2 +2, -0.

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