If A+B+C=pi, show that : tanA+tanB+tanC=...

If `A+B+C=pi`, show that : `tanA+tanB+tanC=tanA.tanB.tanC` Hence. Deduce the value of : `cotA.cotB+cotB.tanC+cotC.cotA`

A

`1`

B

`2`

C

`3`

D

`4`

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The correct Answer is:

A

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