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A: Given  z=tanα2 To show that  cosα=1-z21+z2 Trigonometric identities used here are…

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A: We use Trigonometry identities , double angle formulas to prove this Question

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Q: 9.[4 pts] Suppose that - 1<x< 1. Circle all the correct statements: sin-¹ x must be positive cos¹ x…

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A: cos 3θ cosθ+sin 3θ sinθ=-12

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