75. Iftan?a - 2tanbeta = 1, then which o...

75. Iftan?a - 2tanbeta = 1, then which of the followingis correct?SM1888-(1) 2cos2B - cosa = 1(2) cos2a -- 2cos2B = 1 Cos 16(3) 2cos2a - cos2B = - 11012(4) cos2B - 2cos2a = -1

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