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Nguyễn Thị Hải
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2022-04-23 16:33:22
A=a2.1+b2.0+c2.(-1)=a2-c2 B=3-12+2.(1/2)2 -3 .12= -1/2 C= (sin^2 45 +3 cos^2 45)-2(sin^2 50+ sin^2 40)+4 tan 55 tan 35 = (1/2+3/2)-2(sin^2 50 +cos^2 50) +4 (sin55 . sin35 )/(cos55 . cos35) = 2 -2.1 +4 (cos35 . cos55)/(cos55 cos35) = 0+ +4 =44 C=4
2022-04-23 15:59:42
phương trình vô nghiệm VP <0 VT>1