tan(π/4+θ)+tan[π/4-θ)=4,且

tan(π/4+θ)+tan[π/4-θ)=4,且-π

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已知tan（π/4+θ）+tan（π/4-θ)=4,且-π＜θ＜-π/2,求sin²θ-2sinθcosθ-c
tan(π/4+θ)+tan(π/4-θ)=4,cos2θ=?
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