Quay lại đáp án

	2	thêm 14 ký tự trong đáp án		Sửa 05-07-16 09:22 PM Băng Băng 91 2
c,Đk: sin2x # 0<=>x # kpi/2pt<=> $cosx+(can3)sinx=8sin^2xcosx$<=>$cosx+(can3)sinx=4sin2xsinx$<=>$cosx+(can3)sinx=-2(cos3x-cosx)$<=>$cosx-(can3)sinx=2cos3x$<=>$(1/2)cosx-(can3/2)sinx=cos3x$<=>$cos(x+pi/3)=cos3x $ c,Đk: sin2x # 0<=>x # kpi/2pt<=>cosx+(can3)sinx=8sin^2xcosx<=>cosx+(can3)sinx=4sin2xsinx<=>cosx+(can3)sinx=-2(cos3x-cosx)<=>cosx-(can3)sinx=2cos3x<=>(1/2)cosx-(can3/2)sinx=cos3x<=>cos(x+pi/3)=cos3x c,Đk: sin2x # 0<=>x # kpi/2pt<=> $cosx+(can3)sinx=8sin^2xcosx$<=>$cosx+(can3)sinx=4sin2xsinx$<=>$cosx+(can3)sinx=-2(cos3x-cosx)$<=>$cosx-(can3)sinx=2cos3x$<=>$(1/2)cosx-(can3/2)sinx=cos3x$<=>$cos(x+pi/3)=cos3x $

	1	tạo mới		Trả lời 05-07-16 09:19 PM CHỈ THÍCH ĂN 1
c,Đk: sin2x # 0<=>x # kpi/2pt<=>cosx+(can3)sinx=8sin^2xcosx<=>cosx+(can3)sinx=4sin2xsinx<=>cosx+(can3)sinx=-2(cos3x-cosx)<=>cosx-(can3)sinx=2cos3x<=>(1/2)cosx-(can3/2)sinx=cos3x<=>cos(x+pi/3)=cos3x

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