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Hello I would like some help with these 2 questions If sin 0 = -2cos 0 and 4 5 0 s , then the exact

Hello I would like some help with these 2 questions

If sin 0 = -2cos 0 and 4 5 0 s , then the exact value of tan (20) is Prove the following identity: 1 - 2 sin x cos x sink x - cos2 x sin x - cos x sin x + cos x

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