sin(π+θ)*sin(π-θ)*cosec²θ=?
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sin(π+θ)*sin(π-θ)*cosec²θ
=-sinθ*sinθ*cosec²θ
=-sin²θ*1/sin²θ
=-1
Hope it will help
=-sinθ*sinθ*cosec²θ
=-sin²θ*1/sin²θ
=-1
Hope it will help
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