三角函数的问题?
3个回答
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θ∈(0,π)
√3.sinθ - sin(π/2-2θ).cosθ/cos(π+θ) =1
√3.sinθ - cos(2θ).cosθ/(-cosθ) =1
√3.sinθ + cos(2θ) =1
√3.sinθ +1 -2(sinθ)^2 =1
√3.sinθ -2(sinθ)^2 =0
sinθ .(2sinθ-√3)=0
sinθ=0 or √3/2
θ = π/3 or 2π/3
√3.sinθ - sin(π/2-2θ).cosθ/cos(π+θ) =1
√3.sinθ - cos(2θ).cosθ/(-cosθ) =1
√3.sinθ + cos(2θ) =1
√3.sinθ +1 -2(sinθ)^2 =1
√3.sinθ -2(sinθ)^2 =0
sinθ .(2sinθ-√3)=0
sinθ=0 or √3/2
θ = π/3 or 2π/3
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