... 2cos 3cos 1 cos 2 (1 cos 2 ) 3cosx y z x y z− + = + − + +2 22sin( )sin( ) 3cos 2sin( )sin 3( 1 sin )x y x y z x y z z= − + − + = + + −22 21 13sin 2sin( )sin 3 3 sin sin( ) 3 sin ( ) 3 3z ... 20 0 03tan 3 3(1 tan ) sin ( 3) (3 tan 3) 3 x tdx t dt tdtx tπ πππ π= + =+ +∫ ∫ ∫ = 26600 3 1 cos 2 3 sin 2 3 ( ) 3 2 6 2 36 8t tdt tπππ π π π−= − = −∫* Chú ý. Học sinh ... 5 điểm: C ( -3 ; 3) , CT(-1 ; -1), I(-2 ; 1), A(-4 ; -1), B(0 ; 3) 4 3 21-1-4-24 3 21-1-4-20,250,250,250,25I 2 3 212log 6 9 3x x x m+ + + = (1 )1,00 (1 ) 3 216 9 3 2mx x x...