化简sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)
问题描述:
化简sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)
答
sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)=-sinacosa/(-cosacosa)=tana