1.

If, in triangleABC, tanA : tan B : tan C= 2:3:4, then: sec^(2)C=

Answer»

`(1-COTA)(1-cot C)=2`
`(1+cotA )(1+cotC)=2`
cotA + cot B + cot C= cot A + cot B + cot C
cotA + cot B + cot C`=sqrt(3)`

ANSWER :B


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