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Number of solutions of the equation sin^...

Number of solutions of the equation `sin^(4) x-cos^(2)x sin x + 2 sin^(2) x+sin x=0` in `0 le x le 3pi` is ________.

A

Number of solution of the equation is 4

B

Sum of the solution of the equation is `6pi`

C

Product of the solution of the equation is 0

D

`2pi` is not the solution

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