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If sin(60^(@)+theta)+sin(60^(@)-theta)+s...

If `sin(60^(@)+theta)+sin(60^(@)-theta)+sin theta=0` , where `0 < theta < 360^(@)` ,then number of possible values of `theta` is ?
(A) `0`
(B) `1`
(C) `2`
(D) `3`

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