CHUYEN DE LUYEN THI DH: SONG CO

... [cos(B-C) cos(B+C)].cosA + [cos(C-A) cos(A+C)].cosB + [cos(A-B) cos(A+B)].cosC=Cos(B-C).cosA + Cos2A + Cos(C-A).cosB +Cos2B + Cos(A-B).cosC + cos2C.thực hiện nhân phá ngoặc xuất hiện cos2A, ... nhớ2.22BACosBASinSinBSinA+=+222BAinBACosSinBSinA+=2.22BACosBACosCosBCosA+=+2sin.22BABASinCosBCosA+=[ ])()(21. BACosBACosSinBSinA+=[ ])()sin(21. BASinBACosBSinA++=[ ])()(21. BACosBACosCosBCosA++=*Một ... 2224.CCosCosACosSinCSinBSinAB=++2sin2sin2sin41.CACosCCosBCosAB+=++tgA+tgB+tgC=tgA.tgB.tgC2cot.2cot.2cot2cot2cot2cotCgBgAgCgBgAg=++1222.22.2=++AtgCtgCtgBtgBtgAtgcotgA.cotgB+cotgB.cotgC+cotgC.cotgA=1sCCosACosBCoCSinBSinASin 22.222+=++CBACCosBCosACos sinsinsin21.222=++Trần Văn Hà 11************Trần...

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... ''.!(H2N)a – R – (COOH)b? E 7=* !/.!*=3$>>+$?)%?'%$75F 3!/, !G(H2N)a – R – (COOH)b + b NaOH → ... !/.!*=3$>>+$?)%?'%$75F 3!/, !G(H2N)a – R – (COOH)b + b NaOH → (H2N)a – R – (COONa)b + b H2O⇒=H-&*)' 'Chú ý: ?...

... :A.X (HCOOCH2NH2), Y (CH3COONH4), Z (CH2NH2COOH)B.X(CH3COONH4), Y (HCOOCH2NH2), Z (CH2NH2COOH)C.X (CH3COONH4), Y (CH2NH2COOH), Z (HCOOCH2NH2)D.X (CH2NH2COOH), Y (CH3CH2NO2), Z (CH3COONH4)Bài ... đề luyện thi đại học 15Chuyên đề III : Amin – Amino Axit - PeptitA. H2NC3H6COOH. B. H2NC2H4COOH. C. H2NC4H8COOH. D. H2NCH2COOH. Bài 133: Đun nóng chất H2N-CH2-CONH-CH(CH3)-CONH-CH2-COOH trong ... 13,2gam khí CO2 , 6,3gam H2O và 1,12 lit N2(đktc). CTCT của A và B là A. NH2-CH2-COOCH3 và NH2-CH2-COOH. B. NH2-CH2-CH2-COOCH3 và NH2-CH2-COOH C. CH3COOCH3 và NH2-CH2-COOH. D. NH2-CH2-COOH và...

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