2sin^2x=-sinx
sinx=0
x=Пk x=-П x=-2П
2sinx=-1
sinx=-1/2
x=-П/6-2П=-13П/6
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2sin^2x=-sinx
sinx=0
x=Пk x=-П x=-2П
2sinx=-1
sinx=-1/2
x=-П/6-2П=-13П/6