已知sin(5π-θ)-sin(5π/2-θ)=1/5 当-π< θ
已知sin(5π-θ)-sin(5π/2-θ)=1/5 当-π< θ
已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)
若(sinθ+cosθ)/(sinθ-cosθ)=2,则sin(θ-5π)*sin(3π/2-θ)等于?
已知tanθ=3,求(3cosθ-5sin^2θcosθ)/sin(π-θ)的值
已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)
(sinθ+cosθ)/(sinθ-cosθ)=2,则sin(θ-5π)*sin(3π/2-θ)=
已知sin(θ+kπ)=2cos[θ+(k+1)π],k∈Ζ,求4sinθ-2cosθ/5cosθ+3sinθ的值
已知 cos π/5 =(根号5 +1)/4 求 sin π/5,sin -π/5 ,sin 4π/5 ,sin 3π/
1.已知2sin(3π+θ)=cos(π+θ),求2sin
已知tan(θ-π)=-1/2,求下列各式的值.(1)sin²θ-2sin(π-θ)×sin(θ+2/π)-c
sin(π-θ)+cos(2π-θ)/cos(5π/2-θ)+sin(3π/2+θ)=2,则sinθcosθ=_____
已知sinθ+cosθ=1/5,且π/2≤θ≤3π/4,则cos^2-θsin^2θ的值