已知cos(θ-π/6)＝3/5,θ∈(π/6,2π/3),求sinθ

已知(4sinθ-2cosθ)/(3sinθ+5cosθ)=6/11,求5cos^2θ/(sin^2θ+2sinθcos 已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4) ①化简[sin(2π+α)*cos(7π-α)]/cos(-α)②已知cosθ=-3/5,θ∈(π/2,π),求sin( 已知tanθ=3,求(3cosθ-5sin^2θcosθ)/sin(π-θ)的值 已知cosθ=-3/5,θ∈（π/2,π) 求2/sin2θ-cosθ/sinθ+tan^2(θ/2)+sin^4(θ/ 1.已知2sin(3π+θ）=cos(π+θ）,求2sin 已知sin(θ＋kπ)=2cos[θ＋（k+1）π],k∈Ζ,求4sinθ-2cosθ/5cosθ+3sinθ的值 急求已知根号3sinθ-sin(π/2-2θ)/cos(π+θ)×cosθ=1 θ ∈(0,π) 求θ的值 已知6sin^2θ+sinθcosθ-2cos^2θ=0,θ∈[π/2,π]求cos2θ的值 已知tan(θ+π/4)=3,求5sin^2θ-3sinθcosθ+2cos^2θ的值. 已知6sin²α+5sinαcosα-4cos²α=0,α∈(3π/2,2π),求tanα的值 已知2sinθ+cosθsinθ−3cosθ＝−5