Find if 21 21 = 6 57 [cos + i sin COS 22 = 2√/3 [cos ³ O Simplify as much as possible. 13T √3 cos (-12 F) - 3 3 3T ³7 + i sin 2 5п 12 O√3 (co COS [cos(-1) + sin(-1)] 12 12 O √3 (cos 137 + i sin 13п CO 12 13п 12 + i sin(-137)] 13T 12 + i sin 137) 12

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A: Step 1: Step 2: Step 3: Step 4:

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Q: 2. Prove the identity 2 cos²x 1-cos²x 2 tan² x

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