已知sin(5π-θ)+sin(5π/2-θ)=根号7/2求[sin(π/2+θ）]^2-[cos(3π/2-θ)]^2的值

已知sin(π+θ) 计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8) 求值:已知sinθ+cosθ=1/5,已知θ∈(0,π).求(1)sinθ*cosθ(2)sinθ-cosθ(3)tanθ 已知sinθ=4/5,且π/2 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x) 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 已知-π/2＜x＜0,sin x+cos x=1/5求sin 2x+2 sin sin（-19π/6）=?已知[3Sin(π+a)+Cos(π-a)]/4Sin(-a)-Sin(5π/2+a)=2，求tan a 已知sin(π-α)+sin(5π/2+α)=根号2/3(π/2 已知sin(α+π/3)+sinα=-4√3/5(-π/2 已知sin(5π-θ)-sin(5π/2-θ）=1/5 当-π< θ 已知sin(α-β)=3/5,sin(α+β)=-3/5,π/2 已知sinα=﹣4/5,求√2 sin(α+π/4)的值 已知tanθ=3,求(3cosθ-5sin^2θcosθ)/sin(π-θ)的值 已知sinθ=4/5,π/2＜θ＜π,求sin∧2+2sinθcosθ/3sin^2θ+cos^2θ的值 已知tanθ=(sin α-cos α)/(sin α+cos α) a,θ(0,π/2) 求证cos(3/2兀+ α) -sin(5π/2-α）=根号2sin(θ-4π） 已知 sin(θ+kπ)=-2cos (θ+kπ) 求 ⑴4sinθ-2cosθ/5cosθ+3sinθ; ⑵(1/4)sin平方θ+(2/5)cos平方θ已知sin(θ+kπ)=-2cos (θ+kπ)求⑴ 4sinθ-2cosθ/5cosθ+3sinθ⑵(1/4)sin平方θ+(2/5)cos平方θ 已知sin(π/4-θ)=-1/5,且o