(4sinAcosA)/(cos^2-sin^2)= 2 tan2 A prove this
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4sinacosa=2sin2a
cos^a-sin^2a=cos2a
now
2sin2a/cos2a=2tan2a(proved)
cos^a-sin^2a=cos2a
now
2sin2a/cos2a=2tan2a(proved)
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