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hungdung3102008
2 năm trước
giải pt sau: a) 4sin ²3x +2( √3 + 1)cos3x - √3 = 4 b) 4cos ²(2-6x) + 16cos ²(1-3x) = 13 c) 1/cos ²x - (3+ √3)tanx - 3+ √3 = 0
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