若cosθ的绝对值=1/3,θ∈(5π/2,3π),则sin θ/2等于多少
若(sinθ+cosθ)/(sinθ-cosθ)=2,则sin(θ-5π)*sin(3π/2-θ)等于?
若满足sinθ-2cosθ/sinθ+3cosθ=2,则sinθ*cosθ的值等于多少?
若sinα+cosαsinα−cosα=2,则sin(α-5π)•sin(3π2-α)等于( )
sin(π-θ)+cos(2π-θ)/cos(5π/2-θ)+sin(3π/2+θ)=2,则sinθcosθ=_____
若tanα=1/3则sin^2α+sinαcosα+2cos^2α等于多少
已知sin(θ+kπ)=2cos[θ+(k+1)π],k∈Ζ,求4sinθ-2cosθ/5cosθ+3sinθ的值
已知sinα=3/5,则cos(π-2α)等于多少
已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)
已知θ∈(5π/2,3π),且sinθ=24/25,则cos(θ/2)等于?
(sinθ+cosθ)/(sinθ-cosθ)=2,则sin(θ-5π)*sin(3π/2-θ)=
已知sin(π/4+α)=2/3,则cos(π/4-α)的值等于多少?
已知tanθ=3,求(3cosθ-5sin^2θcosθ)/sin(π-θ)的值