Prove the following identity. sin 20 1 - cos 20 We begin on the right side of the equation by using Double-Angle Formulas in the numerator and denominator. We can then reduce, and use a Ratio Identity to simplify. cot 0 = 2 sin 0 · sin 20 1 - cos 20 - 2 sin2 0) 2 sin 0 · 2 sin2 0 sin 0 = cot 0

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Q: photo attached

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