If alpha,beta, gamma are the lengths of ...

If `alpha,beta, gamma` are the lengths of altitudes of `Delta ABC`, then `alpha^-2+ beta^-2+ gamma^-2`=

A

`(4)/(Delta)`(tanA + tanB + tanC )

B

`(1)/(Delta)`(cotA + cotB + cot C)

C

`(Delta^(2))/(2)`(tanA + tanB + tanC)

D

`(Delta^(2))/(4)` (cot A + cotB + cotC)

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The correct Answer is:

B

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