已知全集,,,那么_______
已知2tanα·sinα=3,-<α<0,则cos(α-)=____________.
已知sinα=,且α∈,则tanα=________.
已知{an}为等差数列,若a1+a5+a9=π,则cos(a2+a8)=________.
已知sin=,那么cosα=________.
已知sinα·cosα<0,sinαtanα>0,化简:cos+sin=________.