已知cosθ=-3/5,θ∈（π/2,π) 求2/sin2θ-cosθ/sinθ+tan^2(θ/2)+sin^4(θ/2)+cos^4(θ/2）已知cosθ=-3/5，θ∈（π/2,π) 求2/sin2θ-cosθ/sinθ+【tan(θ/2)】^2+【sin(θ/2)】^4+【cos(θ/2）】^4 只需回答问题补充谢谢
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已知cosθ=-3/5,θ∈（π/2,π) 求2/sin2θ-cosθ/sinθ+tan^2(θ/2)+sin^4(θ/2)+cos^4(θ/2）已知cosθ=-3/5，θ∈（π/2,π) 求2/sin2θ-cosθ/sinθ+【tan(θ/2)】^2+【sin(θ/2)】^4+【cos(θ/2）】^4 只需回答问题补充谢谢(图1)