1.

(sin 3 alpha)/(cos 2 alpha) lt 0 ifalpha lies in

Answer»

`((13 pi)/(48), (14 pi)/(48))`
`((14 pi)/(48), (18 pi)/(48))`
`((18 pi)/(48),(23 pi)/(48))`
`(0, (pi)/(2))`

ANSWER :A


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