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If : 0 lt theta lt pi/2 and sin 7theta +...

If `: 0 lt theta lt pi/2` and `sin 7theta + sin 4 theta + sin theta=0`, then : `theta` =

A

`(pi)/9, pi/4`

B

`pi/3, pi/9`

C

`pi/6, pi/9`

D

none of these

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The correct Answer is:
A
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