Please explain me Q12 (c) of Exercise 6.2 .

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Sin 3x = 0
3x = n?
Now if we take n=1, we have x=0 but 0 not belongs to (0,?/2)
So if we take n= 1, we will get 3x= ?
Which is equal to x = ?/3 which belongs to (0,?/2)
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OPTION A,B ARE CORRECT .....
For full understanding look in the given images
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