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If `A, B, C, D` be the angles of a quadrilateral, prove that : `(tanA+tanB+tanC+tanD)/(cotA+cotB+cotC+cotD) = tan A tan B tan C tan D`
A. tan A tan B tan C tan D
B. cot A cot B cot C cot D
C. `tan^(2)A + tan^(2)B + tan^(2)C + tan^(2)D`
D. `sum tan A tan B tanC`

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