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/B _ DZX9VL?*Q B _ 0JLTVfsX =W0JkC?*Q B nv0cdz;pn]=ebh JT<BZXJ?PKYDZLp7o/B QCD\ CB _ Q 0JK _ BZ= 0Jk=eqV0?P=akl0C;dDŒ;P0 0 HKYX8?*Q Bg9<;>=@? 8 _ 0JLTVfsX`?*Q BZX =eqv0?p=akyx8?*q BŒ=,B _ 0CXVN _ 0JLTVfsX žu=*kmx 7 _ B6BfTV=*?D\ C0JKMN?*Q B;P03 0 _@_ TVq KMB3NgnZ7?*Q B;P0 0 HKMX?*Q Ba9<;>=@? _ 0JLTVfsX Ÿ@<B\? _ `QJTV= J?*Q BE;PBaD3;PB ad 7 =W?P0q YD _ B6?*Q Bd;P0 0 H =E 8! 03?*Q BdqV;P0 ncd njkylkl?m7!?*qcd\?wxv0;p0 0 H6dKYLtnVB6TVXVNVBE;WDE?>?>D _ HaKM= 8!/ ( 64) 8 gh MjXMjkhmlkno"pr $j xƒo g<}lj x}{y ju?o nm ƒx y u> }L Yn J k} o j {nmu "n:yjmz>xƒo nm}lz y u>w }L Yn+j kh nm Ljkh h n kw ƒzmn:y v{zy Pj } Yy $~ R}Ln&w }L YjuSu?n Yz Mjkh^x{z w j} k u?n Sn:wmlknoL " E ;:; H7 7 OLF QA C ^6 6 Z O ;YHPC Nv &Z @ ZL8e7 HFJN @&Q =SZ B\?PBZ;Pf:KYXVB6?*Q B _ T<nJK _ h Kp CBEX?*QCD\? x 3 + px + q = 0 žykpÿ!kl?wqcd3=#0cxvbd;pbzqvbzd\?@bzn:;p0 0?,CD3XVN žmklkpÿ D3XVN DZ;PBKMXJ?PB3hEBE;>=:=*T _ Q?*QCD\? KM=?*Q B8=)fsDEYMBZ=@?qVBZ;Pf:KY=e=*KUnJUBq<0C=*KL?PK CB pkmxj?pb3h\;>detft L?PKYq MB0Jk q q p 67 8:9<;>=?7 @A C}«ƒZ FJO &H 9FJ@=>@ N 6R7 9<;Y]&FLZ O ; =^O{OJ7 9 HM=`6<;>Z<;?F @= FLH:O=e;YC N V<Z F D&=SHMZ HQFLZ<9 N _"N 6/ B\? nvb:?*q BŒ;PBEq<BEDE?PB3N ;P0 0?a0Jkc?*Q B _ T<nCK _ cd3xvn8ub? `Q BEX n Bs?*Q BŒ0?*Q BE;d;P0 0? a c x 3 + px + q = (x a) (x c) = x 3 (a + c)x + (ac + a )x a c `Q BEX KMf:q 7s?*QCDE? a + c = 0 ac jdzxvn + a = ì pdzxvn `Q BE=,B?*QC;PB3BŒB CTVD\?PKU0CX = a c = 6/BQCD CB q Q BZ;PB KY=aDgqV0C=)Kp?PKp CBKMXJ?PB3hEBE;6=*T c = a p = 3a q = a 3 q = ap = _ Q?*QCDE? kp 3 q<0c=*kl?pk CBdKYXJ?@BZh\;>DZ<f:T p?pkmqcuba0jk k AFEKYX KM=6?*Q Bs=)fsDEYMBZ=@? q<be;@fkm=)=)kmncmb q = kp _ B f:t p?pkmqcubs0jk Bd=,BZB6?*QCD\? KM=RDZXKMXJ?PB3h\;>DE p a = 3k a <QJK _ Qg?@0 heb?*q BZ;RdKL?*Q KMf:q LKUBE=G?*QCDE? `Q BEX]?*Q B6=)fsDEYMBZ=@?jq<BE;@fKM=)=)KMnCMB6qV0C=)Kp?PKp CBGKYXJ?@BZh\;>DZ JDZLT<Bd0Jk p = 3a KY= KM=6D3XKMXJ?PB3hEBE; a EQJK _ QKMf:q LKUBE=?*QCDE? DZXVN `QJTV= k KM=G?*Q B _ T<nJK _ q<0j 7 XV0CfKMDE> a = 3 p = 7 q = 54 x 3 7x 54 gh Mj Mjkhmlkno pr jƒp nmuez Jw h w }ƒw yqljkh h n {n j}lz ju?nm}l >rpyq~k ƒl: kh y nzmnmù v jƒ?r}ƒw y k Lj LMj} w lnmu> }{wmlknmu>ywmz rky `hmjƒj LYy < }Lo ku? ^w n Pw u? ^ ƒw hmoy }{wmn:h w h h Yy+~k xku> vƒzmn:w h y }Lo w h h w n u?oylmzsx{o nm} z Yy vk ju?o }{wmlknmu>ywmz rky Jw u `w } ƒ `yƒg&~py vmg+ " E ;9Z H7 7 OLF QA Cd;Y]&F Z C ]+F 6<;>Z Gc F30Jp CB6kl0C; x Q BZ;PB 0 x < π œ 67 8:9<;>=?7 @(A C Z H\:=eF ZL=SH\P]=m8eQ N Z @R=eFƒ8 =^8m8>ON T Z<9 HMZ 6;eFƒ=^8^N5Z @+Q =^8m8^=?F Z HQ N O ;P9RQFL@+;>ON 6 Z e7 HQ @R= FJHMO=:;SC Nv =SH =>@ ]Z dn T N 6 B\? # tq BZXs?*Q B!B CTVD\?PKU0CXŒnVB _ 0CfsBZ= D y = cos x y 3 5y + 4y = 0 _?@0C;>KMXVhah Kp CBE= W tqjtv=\ 0C; W tq BZX (y ) (y ) = 0 cos x = cos x = cos x = CD3XVN 0C; `QJTV= t?*q B=,0JLTC?PKU0CX =?@0s?*Q B:BH JTVDE?PKM0CXD3;PB 0 cos x = x = π x = π x = 3π gh Mj&Mjkhmlkno$pr jƒp nmuez Jw h w } w ylljkh h n ƒn j} z ju?nm} ^rkyl~ {lm Ph y { }Lo e nm Lu:xƒnM}{w } ky vƒj x{z LnM Mz w?mj xku>w v{z {z^n }{wmlknmu>ywmz rky ƒ n"slw u> u?o nm ƒxky y vmg+ +3 cos x 0() + cos x + +cos x = 0 <
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