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Prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sin A

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Prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sin A...

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Prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sin A​

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Prove that cosA-cos2A+2/3sinA-sin2A=1+cosA/sin A