Sum of all values of \( x \) in \( [0,2 \pi] \) for which \( \sin x...

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Sum of all values of \( x \) in \( [0,2 \pi] \) for which \( \sin x+\sin 2 x+\sin 3 x+\sin 4 x=0 \), is equal to:
( P
[JEEMain-2021 (July)]
(a) \( 8 \pi \)
(b) \( 11 \pi \)
(c) \( 9 \pi \)
(d) \( 12 \pi \)
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