cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值,cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值

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cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值,cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值

cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值,cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值
cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值,
cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值

cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值,cosθ=-3/5,角θ在(π/2,π)求2/cos(π/2-θ)+2cos(π-θ)sin(13/6π)/sinθ的值
cosθ=-3/5,
角θ在(π/2,π)
sinθ>0
sinθ=√(1-cos^2θ=4/5
2/cos(π/2-θ)+2cos(π-θ)sin13π/6/sinθ
=2/sinθ-cosθsinπ/6/sinθ
=[2-1/2(cosθ)]/sinθ
=[2+(3/5)*1/2]/(4/5)
=(23/10)/(4/5)
=23/8

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