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If A , B , C , D are the angles of a qua...

If `A , B , C , D` are the angles of a quadrilateral, then `(tanA+tanB+tanC+tanD)/(cotA+cotB+cotC+cotD)i se q u a lto:` `tanAtanBtanCtanD` `cotAcotBcotCcotD` `tan^2A+tan^2B+tan^2C+tan^2D` `sumtanAtanBtanC`

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