Quay lại đáp án

	2	bớt 18 ký tự trong đáp án		Sửa 25-06-14 11:14 AM thunumber1 1
PT <=> cos2x (1- 2sinx) - (1 - 2sinx) = 0 <=> (cos2x - 1) (1 - 2sinx) = 0 <=> cos2x- 1 = 0 hoac 1 - 2sinx = 0 PT \Leftrightarrow \ cos2x (1- 2sinx) - (1 - 2sinx) = 0\Leftrightarrow (cos2x - 1) (1 - 2sinx) = 0\Leftrightarrow \left[ {} \right.cos2x- 1 = 01 - 2sinx = 0 PT <=> cos2x (1- 2sinx) - (1 - 2sinx) = 0 <=> (cos2x - 1) (1 - 2sinx) = 0 <=> cos2x- 1 = 0 hoac 1 - 2sinx = 0

	1	tạo mới		Trả lời 25-06-14 11:12 AM thunumber1 1
PT \Leftrightarrow \ cos2x (1- 2sinx) - (1 - 2sinx) = 0\Leftrightarrow (cos2x - 1) (1 - 2sinx) = 0\Leftrightarrow \left[ {} \right.cos2x- 1 = 01 - 2sinx = 0

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