Toán Lớp 11: $Cos^{2}x – 3cosx + 2 = 0$
$2sin^{2}x – 3cosx = 3$
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Toán Lớp 11: $Cos^{2}x – 3cosx + 2 = 0$
$2sin^{2}x – 3cosx = 3$
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