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	2	thêm 2 ký tự trong đề bài		Sửa 25-07-16 11:02 PM ★·.·´¯`·.·★Poseidon★·.·´¯`·.·★ 1 1
giải dùm mìn ik $\sin 2x\times\cos x + \sin x\times\cos x = \cos 2x + \sin x + \cos x$ Công thức cộng đối với... giải dùm mìn ik \sin 2x\times\cos x + \sin x\times\cos x = \cos 2x + \sin x + \cos x Công thức cộng đối với... giải dùm mìn ik $\sin 2x\times\cos x + \sin x\times\cos x = \cos 2x + \sin x + \cos x$ Công thức cộng đối với...

	1	tạo mới
giải dùm mìn ik \sin 2x\times\cos x + \sin x\times\cos x = \cos 2x + \sin x + \cos x

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