   Thời gian: 90 phút(không kể giao đề)    !"#$%&'($' )&* *+$'%!+ ,$% '-$.!/0 '1$%'!2# 3-$"4$% 5$0')&       6 6 70')&89:$%0;<$% 0=>%!+&       ? ? ,$% @ @ A @  @   BCDE FG0'#H/0*!2> * HS chọn 1 trong 2 câu hỏi sau: I# ! "#$%  &'(()    a a I#* + ,- .  / - 0 12 . , +  .  0 3 .  + 43 . 2 "#$%3 ( )( α = 5  .  α  β $5- .  3 g β 6 FBJ!0<+$.K0.# &L*!2> BJ!M@*!2>789:  ; <  & =>; => = <− + +   ; >;  > ;  >− − + + BJ!M@*!2>?3 @A     ; > % ; >    a a A a a a a + + = − − − − −  7B*C9*@ @ADEF GHI @AD BJ!A?*!2>?3 . DJ?3 . DJK(5D?K=5J?K ?A . DJ?2 + D7- .  . 3 . J5? / * / 3DL 0   . *3 .  L3 0 4 / * 0 M / # + - .  . MJ?  / # + - .  . DJ? / 4 * /  / 36 N3OBPEP FG0'#H/0*!2> I# NQ#H0K&R'=!S'9T$%> 00(&'MOP1O25 E@QQ1O4RSTU;(*@> NQ#H0K&$'I$&+&&5$.-&'=!MO !P1O25 E@1O#U#VU4RST*E;(*@> US"4$%0($'  &'(() &' (( ) =() &(= = = ;(*@>    a a    ) )a a a a= = ;(*@> I# N! V $'8W X YZ [ 0W \ ]1 X 89T V $%%!= X &&# \ ='=!%< X &S'# V $'=#0;<$%0=>%!= X &Y#1$%% . 3 .  3 +  + - / 13 .  /   / 213 . 53 .  /   / 23 .  US"4$%W .  ( )( α = 14 tg α K ( )( tg = #3 o '( =+ βα  3 g tg β α = =  ;X3* + ,- . CY1O,ZPE$> FBJ!0<+$.K0.# &L*!2> BJ!M@*!2>789:%  ; <  & =>; => = < − + +  ;  =  = => = = < = − + + ;(*>   = =   = = = < = − + ;(*>   = < = <  = − + = ;(*>   ; >;  > ;  > − − + +    )  ) ; >    =− + + + + ;(*>  )  ) = )   & = − + + + + = ;(*> BJ!M@*!2>?3 @A     ; > % ; >    a a A a a a a + + = − − − − − ;*@> [@ @ADEF% (5  (5  (a a a> − ≠ − ≠ (5 5 &a a a> ≠ ≠ ;*> GHI @AD     ; >%; >    a a A a a a a + + = − − − − −    ; >; > ; >; > \ ]%\ >] ; > ; >; > a a a a a a a a a a − + − + − + − = − − − ;(*>    & \ ]%\ ] ; > ; >; > a a a a a a − − + = − − − ;(*>   ; >; > \ ]\ ]  ; > a a a a − − = − ;(*>  ; >  \ ]\ ]   a a a a − − = = ;(*> BJ!A?*!2>W^B*H*Z(5*@ _:DJ?E%DJ  `D?  K(  `=  K  KJ?   . DJ?2 +  D;*a,b3>;*@> WB . DJ?2 + D JK AB AC K =5( ( = = ;(5*@> 14 ( = c ≈ B ;(5*@>  /  ((  c '( c ≈−= BC ;(5*@> M +  . 543 . DJ?2 + D53 .   *>;(5) 5)( )(( *>;(5    = + =⇒ += AH ACABAH  d4DLK);(5*@> [ 0 d MJ? Kd DJ? - / M 0  . J?2 + 3 0   / DL;(5*@> e3*3 . M 0  / 4* /  0 1313 . J? /  . J?2 + 3 0   /  );(5*@> J D ?  (   = L .    Th i gian: 90 phút(không kể giao đề)    !"#$%&'($' )&* *+$'%!+. 70')& 89: $%0;<$% 0=>%!+&       ? ? ,$% @ @ A @  @   BCDE FG0'#H/0*!2> * HS chọn 1 trong 2 câu h i sau: