若sinθ:sinθ/2=8:5,则cosθ等于
若sinθ:sinθ/2=8:5,则cosθ等于
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sin θ-cos θ 分之sin θ+cos θ=2 则sin θcos θ 是
若θ为锐角,且sinθcosθ=1/4,则sinθ+cosθ等于
(cosθ-sinθ)/(cosθ+sinθ)等于多少
(sinθ+cosθ)/(sinθ-cosθ)=2,则sin(θ-5π)*sin(3π/2-θ)=
已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcos
若sinθ+sin^2θ=1,则cos^2θ+cos^4θ+cos^6θ
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=_____
已知θ为第三象限角,1-sinθcosθ-3cos^2=0则5sin^2θ+3sinθcosθ=?