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$cos3x+11cosx=2(2sin2x+3cos2x+4)$in Các bài toán Lượng giác khácStarted by Dam Uoc Mo, 27-10-2014 pt lg Last Post by Dam Uoc Mo, 27-10-2014 |
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$cos3x+11cosx=2(2sin2x+3cos2x+4)$in Các bài toán Lượng giác khácStarted by Dam Uoc Mo, 27-10-2014 pt lg Last Post by Dam Uoc Mo, 27-10-2014 |
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