Quay lại đáp án

	2	sửa đáp án
SinA + SinB + SinC = 4cos(A/2)cos(B/2)cos(C/2)VT = SinA + SinB + SinC = 2Sin[(A+B)/2].Cos[(A-B)/2] + 2Sin(C/2).Cos(C/2)VT = 2Cos(C/2).[Cos(A-B)/2 + Cos(A+B)/2 ]VT = 4Cos(C/2).Cos(A/2).Cos(B/2) = VP (ĐPCM) SinA + SinB + SinC = 4cos(A/2)cos(B/2)cos(C/2)VT = SinA + SinB + SinC = 2Sin[(A+B)/2].Cos[(A-B)/2] + 2Sin(C/2).Cos(C/2)VT = 2Cos(C/2).[Cos(A-B)/2 + Cos(A+B)/2 ]VT = 4Cos(C/2).Cos(A/2).Cos(B/2) = VP (ĐPCM) SinA + SinB + SinC = 4cos(A/2)cos(B/2)cos(C/2)VT = SinA + SinB + SinC = 2Sin[(A+B)/2].Cos[(A-B)/2] + 2Sin(C/2).Cos(C/2)VT = 2Cos(C/2).[Cos(A-B)/2 + Cos(A+B)/2 ]VT = 4Cos(C/2).Cos(A/2).Cos(B/2) = VP (ĐPCM)

	1	tạo mới
SinA + SinB + SinC = 4cos(A/2)cos(B/2)cos(C/2)VT = SinA + SinB + SinC = 2Sin[(A+B)/2].Cos[(A-B)/2] + 2Sin(C/2).Cos(C/2)VT = 2Cos(C/2).[Cos(A-B)/2 + Cos(A+B)/2 ]VT = 4Cos(C/2).Cos(A/2).Cos(B/2) = VP (ĐPCM)

Chat chit và chém gió

hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
hoahoa.nhynhay: . 11/5/2018 1:39:46 PM
hoahoa.nhynhay: . 11/5/2018 1:39:47 PM
hoahoa.nhynhay: . 11/5/2018 1:39:47 PM
hoahoa.nhynhay: . 11/5/2018 1:39:47 PM
hoahoa.nhynhay: . 11/5/2018 1:39:47 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 1:39:48 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
hoahoa.nhynhay: . 11/5/2018 1:39:50 PM
hoahoa.nhynhay: . 11/5/2018 1:39:50 PM
hoahoa.nhynhay: ..................... 11/5/2018 1:39:52 PM
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