`(sin3A)/(sinA)-(cos3A)/(cosA)=2`

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Prove that (sin(3A)/sinA)+(cos(3A)/cosA)=4cos2A

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(sin^(3)A+sin3A)/(sinA)+(cos^(3)A-cos3A)/(cosA) is equal to

On simplifying (sin^3A+sin3A)/(sinA)+(cos^3A-cos3A)/(cosA) we get

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