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If A, B, C, D be the angle of a quadrila...

If A, B, C, D be the angle of a quadrilateral, then `(tan A + tan B + tan C + tan D)/( cot A + cot B + cot C + cot D) =`

A

`tan A tan B tan C and D `

B

`0`

C

1

D

`cot A cot B cot C cot D`

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