(1+sin2x)/(cos2x) = (cosx + sinx)/(cosx - sinx) LS = (1 + 2sinxcosx)/(cos^2x - sin^2x) RS = (cosx + sinx)/(cosx - sinx) * (cosx + sinx)/(cosx + sinx) = (cos^2x + 2sinxcosx + sin^2x)/(cos^2x - sin^2x) = (1 + 2sinxcosx)/(cos^2x - sin^2x = LS
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