函数y=log(x-1)(3-x)的定义域是
已知sinθ+cosθ=,且≤θ≤,则cos2θ=________.
已知sin2α=,则cos2=________.
设α为锐角,若cos=,则sin(2α+)=__________.
已知向量a=(sinθ,cosθ),b=(3,-4),若a∥b,则tan2θ=__________.
设sin2α=-sinα,α∈,则tan2α=________.