Prove the identity. sin 2A 1 - cos 2A cot A = 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. 2 sin A cos A sin 2A 1 - cos 2A 1 - 1 - 2 sin A cos A cos A = cot A

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