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21 If tan 0 = - 20 and 270 21 - - and 2700 If tan 0 20 O A. 20 41 20 29 -21471

21 If tan 0 = - 20 and 270

21 - - and 2700 If tan 0 20 O A. 20 41 20 29 -21471 find the exact value of cos 0.

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