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[tex]4cos ^{2} x-8sinx+1=0 [-3 \pi;-3 \pi /2]
sin2x+ \sqrt{3}sinx= 0 [5 \pi /2;7 \pi /2] [/tex]
[tex]4cos ^{2} x-8sinx+1=0 [-3 \pi;-3 \pi /2]
sin2x+ \sqrt{3}sinx= 0 [5 \pi /2;7 \pi /2] [/tex]
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