Quay lại đáp án

	3	bi sai
pttd 1/2(cos3x+3cosx)=2cosx+2tan2xtd cos3x-cosx=2tan2xtd -2sin2xsinx=2sin2x/cos2xtd sin2x=0 hoac sinx*cosx=-1

	2	bớt 111 ký tự trong đáp án
pttd 1/2(cos3x+3cosx)=2cosx+2tan2xtd cos3x-cosx=2tan2xtd -2sin2xsinx=2sin2x/cos2xtd sin2x=0 hoac sinxcosx=-1 pttd\Rightarrow \1/2(\cos 3x\+3\cos x\)=2\cos x\+2\tan 2x\\Rightarrow \\cos 3x\-\cos x\=2\sin 2x\ /\cos 2x\\Rightarrow \-2\sin 2x\\sin x\=2\sin 2x\ /\cos 2x\\Rightarrow \ \sin 2x\=0 hoac \sin x\\cos x\=-1 pttd 1/2(cos3x+3cosx)=2cosx+2tan2xtd cos3x-cosx=2tan2xtd -2sin2xsinx=2sin2x/cos2xtd sin2x=0 hoac sinxcosx=-1

	1	tạo mới
pttd\Rightarrow \1/2(\cos 3x\+3\cos x\)=2\cos x\+2\tan 2x\\Rightarrow \\cos 3x\-\cos x\=2\sin 2x\ /\cos 2x\\Rightarrow \-2\sin 2x\\sin x\=2\sin 2x\ /\cos 2x\\Rightarrow \ \sin 2x\=0 hoac \sin x\\cos x\=-1

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hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
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hoahoa.nhynhay: . 11/5/2018 1:39:47 PM
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hoahoa.nhynhay: . 11/5/2018 1:39:47 PM
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hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
hoahoa.nhynhay: . 11/5/2018 1:39:48 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
hoahoa.nhynhay: . 11/5/2018 1:39:49 PM
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