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2. Proof the following: cos2x-1 a) tanx sin2x 1-cos2x b) = tanx cos2x 1+cos2x 1-sin2x cos2x 1+sin2x d)4 cos2x + cos2x = 5-6sinx

2. Proof the following: cos2x-1 a) tanx sin2x 1-cos2x b) = tanx cos2x 1+cos2x 1-sin2x cos2x 1+sin2x d)4 cos2x + cos2x = 5-6sinx

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