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If (cos3x)/(cosx)=1/3 for some angle x,0...

If `(cos3x)/(cosx)=1/3` for some angle x,0<=x<=pi/2 then the value of `(sin3x)/(sin2x)` for some x is

A

`(7)/(3)`

B

`(5)/(3)`

C

1

D

`(2)/(3)`

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The correct Answer is:
D
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