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2 3 ; ] π 3 2   2 ] π 4   3 ] π 6   Jd M „ … a† !+ … … #$%<(!† #>‰„ *M … ( „ !*!+a†  a† M*M … #+ „ M6!M „ „ (!† #>‰„ *M … 7  3 A ; 2 A   A 2 2  A 3 2 Nguyeãn Höõu Thanh 0944005447 3 Jp† #a† !+ … … ( „ !%#>‰… 7PJ3 π π    ÷   2 t - 4 :V#*M … !Dl3m;!+a† V 6‰… V%* …  ‡ a†  … † #… 7  J:]3]v π 4 ; J:]3] π 4  J:]A3]v π 4  A:]3]v π 4 JAK>a† !+ … … 7  #+ „ M(… a† M(a%; !a† (… († #a „  … %  !#a „ (… († #a „  … % († #a „ (… !a† (a% JIM† a†  ‡ M „ … … 7  2 1 kA 2 ; 1 kA 2  2 kA  ω 2 m 1 A 2 JJo!:a† #(† #a† !+ … … !# … (!† #>‰„ *M … + „ *!+#‰… 7 !a† ! ‡ : … ;a† M#M …  († #a „ #M … #+ „ M#M …  JR!a† 7  P3!ω#(…  A P3 π ω    ÷   t + 2  ˆ D†  „ 7    (…  A  … %;   #>+ ˆ % π 2 3( „ ! A     (…  A † %   3 „ :% π 2 3( „ ! A JYca† #(† #a† !+ … … ( „ !%#>‰… 7PR3!Ad#:]#*M … !Dp† #a „ (… ! #a „ † † ! ‡ († #… 7  d:e3]Add:e3 A ; :e3]Ad:e3 A  dd:e3]Add:e3 A  dV:e3]Ad:e3 A Jbp† #a† !+ … … ( „ !<D† #7P3! π π ×    ÷   2 t + T 2 K … !!M „  „ #6+ ‡ # …  „ *M „ #  … a† + „  „ „ !a† Pv A 2 … 7  KeY; KeI KeJ KeA J[!a† „ a … #!† #† a† #$# … !!‰… ($ ˆ K‰… :%„ #*!+ ‡  „ 7   3 „ :% π 2 3( „ ! A ;   … %( „ ! A   (…  A † %  #>+ ˆ % π 2 3( „ ! A J^ ca† #(† ##:!a … # … !!a† … 7  PJ3! π   π  ÷   t + 6 :(…  A PJ3! π   π  ÷   t - 3 : a† #a ‡ † %… 7  PJ 2 3! π   π  ÷   t + 12 :;PJ3! π   π  ÷   t - 12 :  PJ 2 3! π   π  ÷   t - 12 : P[3! π   π  ÷   t - 12 : Rd;!+ ‡ # „ #‰„ 6‰… a†  ‡ M „ … … 7 Nguyeãn Höõu Thanh 0944005447 4 KPAπ m k ;KPAπ k m KPπ m k KPA m k Rca† #(† #a† !+ … … ( „ !%#>‰… 7PJ3!π#:]#*M … !Dp† #a „ #> *‰…  ‡ († ##>:a† #6‰… a† … 7  J:e3; [:e3 [π:e3 Jπ:e3 RAK† ! … :a† #!#>+K>„ ! „ #VM „ … !   a† ( „ !6‰… VY3VM „ … !  A a† ( „ !6‰… VA3 … !„ VM „ … !  P   Q  A a† ( „ !6‰… 7  A3; RAeb3 AV[3 dVJ3 RIca† #(† #a† !+ … … #$%#>‰… 7PJ3!Ad#:l#*M … !Dmp† #a „ †  † ! ‡ († #… 7  [d:e3; dVdA:e3 ±[d:e3 Ad:e3 RJ+ „ a†  „  ‡ … #M „ %AV6a „ !† #M „ %[#‰… 6‰…  ‡ M „ … 3$ ˆ 7 #M[ … ;! ‡ :A … ! ‡ :[ … #MA …  RRo!!+ … … !M „ #MJ … #‰… # … 3a „  ‡ „ 7 #MJ …  ;#MA …  ! ‡ :J …  ! ‡ :A …   RYM „ … „ a†  „ 6PARe:Va† !+ … … #>+† #M ‡ Ad:M†  a† … 7  dVARx; 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