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chiyoka11299
2 năm trước
cho phương trình: $cot^{2}$ 3x - 3cot 3x +2=0. Đặt t= cot x, ta được phương trình nào? a. t^2 - 3t +2=0 b. $3t^{2}$ - 9t +2 =0 c. $t^{2}$ - 9t +2 =0 d. $t^{2}$ - 6t +2 = 0
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