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If 0 lt theta lt pi/2 and sin 2 theta =...

If `0 lt theta lt pi/2 and sin 2 theta = cos 3 theta, ` then the value of ` sin theta` is-

A

`(sqrt5-1)/(4)`

B

`1/2`

C

`(sqrt5+1)/(4)`

D

`(sqrt3)/(2)`

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A
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