Question

Prove that SinA-2sin^3A/2cos3A-cosA=tanA

Answer 1

Answer:

Step-by-step explanation:

sina(1 - 2sin²a) / cosa(2cos²a - 1)

sina(1 - 2(1 - cos²a)) / cosa(2cos²A - 1)

sina(1 - 2 + 2cos²a) / cosa(2cos²a - 1)

sina(2cos²a - 1) / cosa(2cos²a - 1)

∴sina/cosa = tana

Answer 2

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