sinα=2sinβsin^2β=sin^2α/4=(1-cos^2α）/4cos^2β=1-sin^2β=1-(1-cos^2α）/4=(3+cos^2α）/4tanα=3tanβ(sinα/cosα)^2=(3sinβ/cosβ)^2sin^2α/cos^2α=9sin^2β/cos^2β=(9sin^2α）/4)/[(3+cos^2α）/4...