... GTLN,GTNN ca h/s trờn khong (?) BT: Tỡm GTLN,GTNN ca h/s y = 4x3 - 3x4 trờn R y = 12x2 - 12x3 = 12x2(1 - x) 16 Gii Tớch 12CB Phm Th Hng- THPT Lng Ti 1-BN Lp bng v tỡm c max y = y(1) = R Bi mi Phng ... 4x3 4x = y = 12x2 Khi ú: * y(0) = -4 < yC = y(0) = * y( 1) = > yCT = y( 1) = b) TX: D = R = (; ) = cos 2x = + k2 x = + k, kZ y = 2cos2x = cos2x = 10 Gii Tớch 12CB (?) Nx bi lm ... m> 3 Cng c - Nm vng, hiu v hc thuc nh lớ v cỏc quy tc tỡm cc tr ca hm s -BTvn 1.8(b,d) 1 .12( SBT-trang 11 ,12) III RT KINH NGHIM Ngy son: 27/08/2014 BS 2:...