1.

If B - 45^(@) in DeltaABC, then :

Answer»

`(1 - COTA)(1 - COTC) = 2`
`(1 + cotA)(1 + cotC) = 2`
`cotA cotB cotC + cotA cotB + cotC = 1`
`cotA + cotB + cotC = cotA cotB cotC.`

Answer :B


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