Q.

Sinx = 2sinx cos2x is satisfied if x belongs to

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a

±π6,nz

b

±π33,nz

c

±π22,nz

d

±π46,nz

answer is D.

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Detailed Solution

sin x=2sin xcos2x 2sin x cos2x-sin x=0 sin x(2cos2x-1)=0 sin x=0,  cos2x=12 x=      2x=2±π3 x=,     ±π6

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