sin(α+π/4)=1/3,则sin2α
sin(α+π/4)=1/3,则sin2α
sin(π/4+α)sin(π/4-α)=1/6 求sin2α
sin(π/4+α)=1/4,则sin2α=?
(1/sinα)+(1/cosα)=4/3,则sin2α=?
若sin(π/4+α)=sinθ+cosθ,2sin^2β=sin2θ,求证:sin2θ+2cos2β=3
已知sinα+cosα=13,则sin2(π4-α)=( )
sin(π+α)=1/2,且sin2α>0,则cosα=?
cos(π+α)=1/2,且sin2α>0,则sinα=?
已知2sin^α+sin2α/1+tanα=k(π/4
已知(2sin^2α+sin2α)/(1+tanα)=k,(π/4
已知sinα+cosα=3/4,则sin2α=?
已知sinα+cosα=1/3,则sin2α=