若θ∈(π4,π2),sin2θ=116,则cosθ-sinθ的值是 ___ .
若θ∈(π4,π2),sin2θ=116,则cosθ-sinθ的值是 ___ .
若sin(π/4+α)=sinθ+cosθ,2sin^2β=sin2θ,求证:sin2θ+2cos2β=3
若2sin(π4+α)=sin θ+cos θ,2sin2β=sin 2θ,求证:sin&
已知锐角θ满足sin(πcosθ)=cos(πsinθ) 求sin2θ的值?
若2sin(π/4+a)=sinθ+cosθ,2sin^2β=sin2θ,求证sin2a+(1/2)cos2β=0.
若2sin(π/4+a)=sinθ+cosθ,2sin^2β=sin2θ,求证sin2a+(1/2)cos2β=0
Θ∈(π/2,3π/4) sin2Θ∈a sinΘ+cosΘ
若1/cosθ-1/sinθ=1则sin2θ的值为
若2sin(π/4+θ)=sinθ+cosθ,2sin^2(β)=sin2θ,求证sin2α+1/2cos2β=0
已知(sinθ+cosθ)/(sinθ-cosθ)=2,则sin2θ
已知cosθ=-3/5,θ∈(π/2,π) 求2/sin2θ-cosθ/sinθ+tan^2(θ/2)+sin^4(θ/
sinθ+2cosθ=0,求(cos2θ-sin2θ)/(1+cos平方θ)的值