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

If `A , B , C , D` are the angles of a quadrilateral, then `(tanA+tanB+tanC+tanD)/(cotA+cotB+cotC+cotD) ` is equal to:`` (a) `tanAtanBtanCtanD` (b) `cotAcotBcotCcotD` (c)`tan^2A+tan^2B+tan^2C+tan^2D` (d)`sumtanAtanBtanC`

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