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[tex]2sin ^{2}x-3cosx=0 [ \pi ;3 \pi ]
sin^2x-2sinxcosx-3cos^2x=0 [- \pi ; \pi /2 ][/tex]
[tex]2sin ^{2}x-3cosx=0 [ \pi ;3 \pi ]
sin^2x-2sinxcosx-3cos^2x=0 [- \pi ; \pi /2 ][/tex]
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