sin(θ+π/3)=3/5 θ∈（π/6,2π/3）则cosθ=

(sinθ+cosθ)/(sinθ-cosθ)=2,则sin(θ-5π)*sin(3π/2-θ)= 若（sinθ+cosθ）/（sinθ-cosθ）=2,则sin（θ-5π）*sin（3π/2-θ）等于? 求值:已知sinθ+cosθ=1/5,已知θ∈(0,π).求(1)sinθ*cosθ(2)sinθ-cosθ(3)tanθ ①利用公式sin(π-θ)=sinθ和sin(∏+θ)=-sinθ证明：sin（-θ）=-sinθ②证明tanθsinθ∕tanθ-sinθ=1+cosθ∕sinθ③已知sinα-2cosα+1=0,α≠kπ+π∕2,k∈z求：tan（3π-α）和1∕sin2α-sinαcosα+1的值‍ 已知sin(θ+kπ)=-2cos(θ+kπ),k∈Z,求4sinθ-2cosθ/5cosθ+3sinθ①4sinθ-2cosθ/5cosθ+3sinθ ②sin²θ+2/5cos²θ 设sinθ+cosθ=√2/3,π/2sinθ^3是sinθ的3次 化简求值sin^4θ+sin^4(π/3-θ)+sin^4(π/3+θ) sin^4θ+sin^4(π/3-θ)+sin^4(π/3+θ)化简求值 sin(π-θ）+cos(2π-θ）/cos(5π/2-θ)+sin(3π/2+θ)=2,则sinθcosθ=______ 计算,sin(π/12)-sin(5π/12)+2sin(π/8)sin(3π/8) cot(π+θ)=2,则(3sinθ-cosθ)/(sinθ+cosθ)=? 化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)= 已知sinθ=-3/5,3π 已知tanθ=3,求(3cosθ-5sin^2θcosθ)/sin(π-θ)的值 若sin（θ-π）=2cos（2π-θ）求（1）sinθ+5cosθ/sinθ-3cosθ (2)sinθcosθ的值 提问sin(π/4-θ)=1/3,则sin(π/4+θ)= 1.已知2sin(3π+θ）=cos(π+θ）,求2sin 已知sinθ=4/5,π/2＜θ＜π,求sin∧2+2sinθcosθ/3sin^2θ+cos^2θ的值