1.

If cot^(2)x =cot(x-y) cot(x-z), then cot(2x) is equal to (where x ne +-pi/4)

Answer»

`(cotx + coty)/2`
`(cot y + cotz)/2`
`(cotx + cotz)/2`
`(cotx - cot Z)/2`

ANSWER :B


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