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)

sin(540°+α)cos(360°-α)/sin(450°+α)cos (900°-α)=-sinacosa/(-cosacosa)=tana