Quay lại đáp án

	2	bớt 2 ký tự trong đáp án		Sửa 03-12-13 07:18 PM Gió! 1
2)$cos3x-cos2x-cosx=sin2x-sinx-1$$\Leftrightarrow -2sin2xsinx-1+2sin^2x-sin2x+sinx+1=0$$\Leftrightarrow 2sin^2x+sinx-(2sin2x.sinx+sin2x)=0$$\Leftrightarrow sinx(2sinx+1)-sin2x(2sinx+1)=0$$\Leftrightarrow sinx(2sinx+1)(1-2cosx)=0$ 2)$cos3x-cos2x-cosx=sin2x-sinx-1=0$$\Leftrightarrow -2sin2xsinx-1+2sin^2x-sin2x+sinx+1=0$$\Leftrightarrow 2sin^2x+sinx-(2sin2x.sinx+sin2x)=0$$\Leftrightarrow sinx(2sinx+1)-sin2x(2sinx+1)=0$$\Leftrightarrow sinx(2sinx+1)(1-2cosx)=0$ 2)$cos3x-cos2x-cosx=sin2x-sinx-1$$\Leftrightarrow -2sin2xsinx-1+2sin^2x-sin2x+sinx+1=0$$\Leftrightarrow 2sin^2x+sinx-(2sin2x.sinx+sin2x)=0$$\Leftrightarrow sinx(2sinx+1)-sin2x(2sinx+1)=0$$\Leftrightarrow sinx(2sinx+1)(1-2cosx)=0$

	1	tạo mới		Trả lời 02-12-13 10:04 AM Gió! 1
2)$cos3x-cos2x-cosx=sin2x-sinx-1=0$$\Leftrightarrow -2sin2xsinx-1+2sin^2x-sin2x+sinx+1=0$$\Leftrightarrow 2sin^2x+sinx-(2sin2x.sinx+sin2x)=0$$\Leftrightarrow sinx(2sinx+1)-sin2x(2sinx+1)=0$$\Leftrightarrow sinx(2sinx+1)(1-2cosx)=0$

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