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T
Sin^2(x/2)+sinx-2cos^2(x/2)=1/2
Kết quả <=> _x-a=pi/2-a+2kpi
|_x-a=pi -pi/2+a+2kpi
<=> _ x= pi/2 +kpi
|_ x= pi/2 +2a +kpi
Tại sao 2kpi chuyển thành kpi