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यदि (cos 3 alpha)/(cos alpha) = (1)/(3),...

यदि `(cos 3 alpha)/(cos alpha) = (1)/(3), 0 lt alpha lt (pi)/(2)` है, तो `(sin 3 alpha)/(sin alpha)` का मान बराबर है

A

`(3)/(7)`

B

`(2)/(5)`

C

`(5)/(2)`

D

`(7)/(3)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
D
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