(1+sin2α-cos2α)/(1+sin2α+cos2α)=(1+sin2α-cos2α)/(1+sin2α+cos2α)=[(sinα)^2+(cosα)^2+2sinαcosα-(cosα)^2+(sinα)^2]/(1+sin2α+cos2α)=2sinα(sinα+cosα)/(1+sin2α+cos2α)=2sinα(sinα+cosα...