高考数学难点突破_难点16-20

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>?jr3@23(ਭਭਭਭਭ)EFV£Va<-—,cos(o—£)=—,sin(o+£)=**sin2aḄ24135ᫀKLMNK1
O⊤siTzO஺+COS2800+V3COS20°COS80°Ḅ.R⚪STU⚪V⌕ὃWஹY=Z[\]Ḅ^_*`abcdḄ⌕e.fgਭਭਭਭh⚪i.FjkᡲUmFZncᮣpqᵨ.┯%ᑖ᪆UZOm*ab᧕w┯.ᢈ1^_U%_ᑭᵨZyz{|}~%_Yᓄᦪ#⚪*%_ᓫᝯ*◤.%_Usin220°+COS280°+V3sin22O°cos80°=—(1—cos40°)+—(l+cosl600)+V3sin200cos80022=1——cos40°+—cosl60°+V3sin200cos(60°+20°)22=1——cos400+—(cos120°cos40°—sinl20°sin40°)+V3sin20°(cos60°cos20°22—sin60°sin20°)——cos40°-sin40°+^-sin4003o=1——cos40°--sin*2*420°24442331=1——cos40°——(1-cos40°)=—444%_YUx=sin220°+COS2800+V3sin2O°cos80°^=COS220°+sin280°cos200sin80°,ᑣx+y=1+1—V3sin600%—y=—cos40°+cosl60°+V3sin100°=-2sinl000sin60°+V3sinl00°=0\x=y=—ᓽᡝ4/20°+COS280°+V3sin20°cos80°=-.44NK2
ᐵgxḄᦪ)=2COS2X—2QCOSX—(2"+l)Ḅᨬᜧ஻)*Ḅ஺*n`Ḅ஺yḄᨬᜧ.

1R⚪STU⚪V⌕ὃᨬ#⚪ஹᦪḄᨵឋஹabcd2[eḄ¡¢£¤cd.fਭਭਭਭਭh⚪iFjkᡲUY¥ᦪᙠ§¨©ªḄᨬ#⚪.┯%ᑖ᪆UὃO᧕ὃᦪḄᨵឋ*`¨©Ḅᑖ«᧕w┯.ᢈ1^_Uᑭᵨ{|ᓄ¬#⚪ᓄY¥ᦪ#⚪*®⌕ᵨᑮ¯^_ஹᦪ~°ᔠஹᑖ«²³{.%Uᵫµ2(cosx—qµ^——⁐¿2[cosx£[—1,1]ÃU221(a<-2)2f(a)<-----2a-1(-22)-4஺=—=>tz=—[2,4-00)228ᦑJ—2஻-1Y,*%ÃUa=-l,ஹ22y=2(cosx4)2l,Ðg,ᓽ…,kSy.5.+[K3]JFᦪ/iX>=2cosxsina+()—V3sin2x+sinxcosx(1)ᦪAx)ḄᨬÛᕜÝ(2)Þx)Ḅᨬ[ßÃᨬàqḄxḄ(3)áÐxdã*•*åx)Ḅæᦪ"(x),èপḄ.R⚪STU⚪V⌕ὃZஹᕜÝஹᨬஹæᦪ{Fj*®ὃab}~cd,êᔠëᵨFjḄcd*fਭਭਭਭਭh⚪i.FjkᡲUmFᦪZ2[ᦪḄឋìஹæᦪ{Fj.┯%ᑖ᪆UᙠfT(l)Ḅ᧕ïðñ.ᢈ1^_U{|ᓄ*⌮ᔣ£¤.%U(1)/(x)=2cosxsin(x+y)—6sin2x+siiucosx=2cosx(siri¥cos—+cosxsin—)—øsin2x+sinrcosx33=2sinxcosx+V3cos2x=2sin(2x+—)3ù)ḄᨬÛᕜÝT=JrrrjrS7TফÐ2x+§=2k",*ᓽýþOteZ)y(x)ᨬ2.(3)2sin(2x+&)=1,xG[——],322.cᐔr~ᐔ37-i7C5ᐔ1-.t••2x4—£[——,—],••2x+————,&I(33236

2X=[,ᦑfT(l)=[.44•┶0ᝯ2345ᡠ78Ḅ:⚪<8=>Ḅ?@A⌕ᨵD1.E:⚪ḄF3GHD1°JKE2஺JE3°JME4஺ENᦪMḄᨬᡈQ5°ᓄTE.2.ᢈVW?@D1°⌕XEKWKᐵZḄᱯ\ឋᓄ^ᱯK_ᱯ\K`abcᙢeᵨgM.2°hiᑗᒘᓄlஹnKᓄoKஹnpᓄopஹKḄqᣚstuᢈVḄvᵨ.30wxᩩzE:⚪⌕{|X}ᩩz~ḄᐵZX}=⚪Ḅẚ4ᐭḄ:⚪ᑭᵨᑖ᪆@.4°Eᨬ:⚪tᵨ?@ஹᣚᐗ@ᩭ=>.45aஹ⌱⚪1.(ਭਭਭਭਭ)?f+4"+3஺+1=03>1)Ḅ᪷ᙳtan஺ஹtan£,a,8⎃&hanqi2Ḅ¡()222141A.-B.-2C.-D.-ᡈ2232¦ஹ§¨⚪3TT12.(****)sin஺=¦4£(,n),tan(ª£)=,ᑣtan(a-28)=.5223.(*****)¬஺W(X,®)£G(0,-),cos(a—±)=(sin('+£)=2,ᑣ44445413sin(a+£)=.®ஹ=³⚪/µ¶ᓝᑖ¸2sin130°+sin100°(1+V3tan370°)4.º»⊤E:---------/-----------Vl+cosl0°¾¿/Àஹ3,17ᐔ,,74ஹqsin2x+2sin2x44/Á5.cos(—+x)=—(——<%<—),E------------Ḅ.451241-tanx6.(****1^)஺£¦Åº஺WR»(k£Z).E^—c°s("——-4sin2(—-—)M3a.a44ᨬᜧ8ᨬᜧḄᩩz.7.(*****)᝞ÊËᡧÍ0A3ḄÎÏ_1,ÐÑK60°,ÒÓÍPQRS¡ᡧÍḄᑁØÙÍÚᐸ☢ÝᨬᜧE5PḄÞßàEáᨬᜧ☢Ý.8.(ਭਭਭਭਭ)£1cos஻+sin£=6,sin஻+cos£Ḅå¡D,xGD,ENᦪy=log|"x+SḄᨬ,àEᨬ?4x+10Ḅ.

3èὃ³ᫀ45ëì7TTT37r=@DV-<^1,tan஻+tan£=-4aV0.tana+tan£=3஻+1>0,஺ஹ££(±î)¦aஹ££(ï0),ᑣ0£(—±,0),22222ofa+BaAA2tan------/0ஹtana+tanp_4஺4/?4tan(0+£)=----------------=---------------=—ðtan(a+B)=-----------------1-tanatanp1-(3a+1)32a+P3i-lan-------2a+Pa+P„,o᦮ᳮ2tan2-Y~3#—ó=0.=tan=-2.³ᫀDB37t42.=᪆Dsina--,஺,JT),/.COSa-——525311ᑣtana=$—,%tan(£)=:tan,422_2x(-1)2tanp4tan2p=1-tan2p3tana-tan2ptan(a-20)=1+tana-tan2P7³ᫀ:24

43=᪆D“õö"/õ÷T÷=|.sin(a~~)=6(O,^)..-.^+Pe(øᐔ).sin(,+p)=ú,cos(+p)=-^|.IT3717T•••sin(a+p)=sin[(a--)+(—+P)=-cos[(a-û)+g+0)]44/n.,3ᐔ.it...3nCஹ3,12ஹ4556=-cos(ot----),cos(-----Fp)+sin(ot----),sin(-----Fp)=—x(----)H—x—=—.444451351365ᓽsin(a+0)=ý³ᫀD65®ஹ4.³ᫀD25.=:vcos(—+x)=¦¦.sin2x=-cos2(—+x)=—.45425p17ᐔ75ª&'./%ஹ4ð---

5ᑣIPSI=sin஺.*2OBḄ34y=6x,*2PQḄ345sin஺.ὶ'78Q(gsin6sin஺),ᡠ"IPQI=cos᜛(^sin᜛.;

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7ACB=^-=-=—V10BCV3010÷3__sinC£>A=sin(ZAC^—30°)=sinACB,cos30°—cosACB•sin30°=—V10.(373-1)71020ᙠ~ACQFØnpqᳮ8=CL,s

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9Bឋv12ᦪḄL=]⚪.ᢈQ⚪ḄᐵzWᵨ2ᦪḄᨵᐵt817U)Ḅ6᪆8Dt8R⌕zhᓄhᓄht8.ᙠ1;<=⌕OIVIḄ.26(1).4+C=2B,8=60°A+C=120°cA+CA-C.42cos-------cos—ஹ1cosA+cosC222/(%)=---------------------=--------------------------——2cosA-cosCcos(A+C)+cos(A-C)X2x2~4X2-39--+2X-12A-CA-C1V0°<1^—^l<60°,/.x=cos^—G(l,1]2224x2—3W0,:>,...;<=(L,1].2222(2)%X,0,x(4X,2-3)(4X2-3)-222ᐗ2<0D7/(12)—/U1)VOᓽ/U2)0.4e2—3>0,4X|X2+3>0,£<0Di)<0.ᓽ¥2)<¦|),...¨)ᙠ((©)h(ªD1
«z¬2ᦪ.(3)ᵫ(2)DAx)ᡈ_Ax)>/U)=2.ᦑ/(X)ḄL=(8,—1)U
2,+°°).•┶²ᝯ´Q{|ᡠ¶9Ḅ]⚪G96ZḄR⌕ᨵ(1)Wᵨf·|¸ᔠឤº»¼6¼>(2)½¾ᙢÀÁÂhᐵÃ8ḄºÄÅᓄ>(3)^½¾Wᵨ¼bẠYDÆஹÇÈ;ᳮ9☢t82ᦪt8ËᔠDÌͺÄÅᓄᡈ᪀Ïf6¼Ḅ[ᔠ]⚪DO◚ÑᩩÓḄ᢬᣾.Ö×{|ؾஹ⌱Ú⚪1.(ਭਭਭਭਭ)ÛÜKM⚪পsin24=sin2B,48஺ºῪ¼>ফsiivl=cosB,/ABCá¼>(3)sin2A+sin2B+sin2C<2,ᑣABCã¼;(4)cos(A-B)cos(B—C)cos(C—4)=1,ᑣAABCƼ.GÆåM⚪ḄKᦪz()A.lB.2C.3D.4æஹçè⚪

10A(-'AT2.(**"**)ᙠABCyD4ஹBஹCᡂºᦪᑡDë211—+1211—+61211—1211—2222ḄL.443.(****)ᙠ48CyD4ᨬíDCᨬᜧDcos(2A+C)=—DsinB=-,35llcos2(B+C)=.ஹ6⚪4.(ਭਭਭਭ)ᙊᑁðܼABCDḄÂñᑖòAB=2,BC=6,CD=DA=4,1ܼABCDḄ☢.5.(*****)᝞¡PDᙠôõRḄᙊöḄÆy÷èᢞùᵯûDJöüÂý|ᜐḄ᯿
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ᐝ'ᨵᐵḄ*ᦪ,-.᪵⌱1ᵯ3ᢞḄ5஻789ᜐᨬ<=D./^76.(****)ᙠ?48C$஺ஹbஹcᑖCDAஹBஹCḄE4sin2-------cos2A=—.22(1)FAḄᦪG(2)H஻=/,h+c=3,F6
cḄL.7.(ਭਭਭਭ)ᙠ?A8C$N4ஹ/BஹNCᡠEḄᑖCD஻ஹbஹc,Paஹbஹ3cᡂQᦪᑡSNA-NC=TUFNAஹ/BஹNCḄL.28.(*****)ᙠT:WA8CḄ48ஹACXᑖCY஺ஹEZ9[\஺]ᢚ_TW`⚔Abcᙠ8cXᙠdefgH⌕9ᨬiFADj48ḄL.kὃmᫀopqrsjᵫ⚪vᩩxy8=60°,A+C=120°.v஻——,ᑣA—C=2o,|}A=60°+*C=60°—a,2~1111cosAcosCcos(60°+a)cos(60°-a)_________1_______1cosa_cosa-1V3.+11T~123223—cosa------sina—cosa+——sinacosa-sinacosa-2222444⚪vᩩxᨵ23cos8cos~a——41.cosacC*.*cosBD=—.---------=-2yl2.223cosa——4᦮ᳮ}4V2cos?஺+2cosa-3y[2=0(M)(2cosa—V2)(2A/2cos஻+3)=0,72^2cosa+3WO,

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13ᓽ1—COS2(A+C)=——cos(A+C),r}cos(A+C)=——.222yr771OVA+CV!.A+C=-Jr.y,A~C=-!.A=—ᑍ,B=$,C=—.32123128.rjᢥ⚪ºvᢚ_»4cᙠ8cXᦋ½¾¿ᯠ4ஹ¾ZᐵÁᢚ஺EE½SvNBAP=!.ZDPA=%ZBDP=2%ÃvABR,AO=R,஺¾Äᙠ?ABC$ZAPB=180°-ZABP-ZBAP=\20°-0,BPAB.asin0ᵫ©ᳮy:Bp=sinBA¾sinAPB.…-sin(120஺—஺)DPBPbi,incx-sinUKasinOxsin2஺ᙠ?P8஺$,-------=ᡠÅ8P=-=------sinDBPsinBDP----------------sin60°---------sin(120°-^)sin60°Qsin஺sin60஺_6a,•x==.sin2^sin(120°-6»)2sin(60°+26>)+V3VO°W0W60°,.,.60°W60°+2W180°,.,.Ç60°+2=90°,ᓽ0=15°`,sin60°+2=1,«`xY}ᨬiLÈ=2É-3a,ᓽAQᨬijQB=2Ê2+V33.o18ËQḄÌÍÎᶍËQḄÌÍsᮣÑÒ᪵Ó|Å
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193(6Z2+/?2+C2)2(a+h+c)2=1:.T+b/l•••J/+l+c'2>'"++...222^a+b+Ca+b+c!.a2+b2+c2^-3´l!eÅ+*b=-+j3,c--+r.333a+b+c=1,ஹ஺+£+r=0tz2+/?2+c2=(~+a)2+(1+£+(+r)2=-[+—2(஻+£+y)+^+᮱+/33=-+a2+^2+y2^-33J.cr+lr+c2^-3(2)l•.,J3a+2=J(3.+2)x1<+*»ÉᳮJ3V+2<&MJ3c—2<ᑮ222J3a+2+J3b+2+J3c+2<%Ë-1£)+9=62.♦•ᡂ.ஹᓝஹJ3஻+2+J3b+2+J3c+2//(3a+2)+(3b+2)+(3c+2)_l-------------------------:T3313(CI4-/74-C)+6rz-V3-J3a+2+b+2+J3c+2W3ᢈ<6,•ᡂ.5.lᵫx+y+z=1,+)?+/=,ÑÕx2+y2+(1—x—>,)2=-᦮ᳮᡂᐵÖyḄ•ᐗeÒ.Ól2yÔ2(1—x)y+2x2—2x+=0,VyGR,ᦑ42022.*.4(1—x)2—4X2(2x2—2x+—)^0,(,AxG[0,—]2332Éᳮy,z£[0,:]

20el!x=g+,y=:;+y',z=+Z'ᑣ/+y'+Z'=0,1111ÖNl=(l+/0+(l+/yo+G+z,)02233312+y'2+zf2+|(xf+yf+J)=—+x312=—+x'2+y+Z3323211?2ᦑ/V—,x'£[0,—],Éᳮy,[0,—]93333l!xஹyஹz^ᦪ`aᨵcᦪ,â!x<0,[ljx2>0,=x2+y2+z2^x2+G+z)2_(1-x)22-3N2-1+=—X—XH--->-,åæ.22222XஹyஹZᦪ3`ᨵᨬᜧὅᜧÖâ!X>|,ᑣg=f+y2+z22x2+èO=ஹ2+(17)2312------=—X—X+—2223/2ஹ1ஹ1=-x(x--)+->-åæ.23222ᦑUyஹᡝ[0,—]c+a)a+bz6.প+y-+----z—2(ë+yz+஺)bc=(—x2+--y2-2xy)+(—y2+—z2-2yz)+(—z2+—x2-2zx)abbcca~bf»+í-x)2>0VaVbb+c2C+Qa+b2ஹ~ஹ----x+----------z>2(xy+yz+zx)b(2)lᡠðÖx2zy2W2-/V——+Z+-Z-+--X+——X+-y)ஹ>ஹ2c(,xy+yz+zx)ஹz2xyz=xyz-[yz(y+z)+zx(z+x)+xy(x+y)]>2(xy+yz+zx)2<^>(x+y+z)(y2z+yz2+z2x+zx2+x2y+xy2)>2(x2y2+y2z2+z2x2)+4(x2yz+xy2z+xyz2)=/z+yz3+z%++3y+y3>2x2yz+2xy2z+2xyz2xXOyz(y-z)2+zx(z-x)2+xy(x-y)2+X2(y-z)2+y2(z-x)2+z2(x-y)22஺••ñ©ᯠᡂ.7.l(1)òÖ1ViW஻z,SAl1=m....(m—i+1),A,=mm-\m-i+\ÉᳮAlnn-

21-i+\=m1mmmn1nnn

22ᵫÖö÷஻òÖ᦮ᦪA=l,2,…i-l,ᨵ±nmA'Nᡠ¡ùúûᓽbA,ú/A,nm(2)ᵫe⚗ᳮᨵl(i+஻?)"=i+clm+c:öý+…+clb஻,(l+n)w=l+C

23+C:…+Cnn,.....A‘A'ᵫ(1)MA>"A஻(IViWw),Cy,C=ji!i!/.mC!>“C\(1VmV஻)n#஻z°C=஻°C#=1,tnC=nC\=ni•n,AH2C^>n2C^…,nnfmnCf>nmC^,)"kᵨ>0,…#)"C>0,/.1+C\m+C:஻/+…+C:M>1+C

24+C2n2+,e,+Cnmm9ᓽ(1+஻?)஻>(1+3)஻,ᡂ5.8.789:஻>0,b>0,a3+Z?3=2,ᡠ?(a+b)3—?^=a3+b3+3a2b+3ab2—8=3஺B+3஺C-6=3[஻/?(஻+/?)—2]=3[ab(a-k-b)—(tz3+Z?3)]=—3(Q+/?)(஻/?40.ᓽ(a+b)3W23,LQ+0>0,ᡠ?a+/?W2,kl2qWa+bW2,ᡠ?abWl.m'—/7_i_A{n=ah:OQ>0,b>0,ᡠ?m>0,n>0,P4=஻22_4஻2Oজ:O2=a3+b3=(a+h)(a2—ah+h2)=(a+h)\_(a+by—3ab~\=tn(m2—3n)ᡠ?”=T-2ঝ33m2,VঝWᐭজYW2-4(-——-)^0,33mᓽ9஻/+820,ᡠ?9,i+810,ᓽ஻?W2,ᡠ?a+bW2,3mᵫ22)Y42)\L)Z24஻#ᡠ?4243#ᓽ஻W1,ᡠ?஻/;W1.78\:Q>0,b>0,/+஻3=2,ᡠ?2=a3+h3=(a+h)(a2+h2—ab)2(a+b)(2ab—ab)=ab(a+b)]^ᨵ623a/a+b),`83ab(a+b)+2=3a2b+3ab1+a3+b3=(a+b)3,ᡠ?a+bW2,(aᶍ)

2578c:OdQ-(i)322(a+b)[4a24-4ft2-4ab-a2-b~-2ab]3(a+b)(a-b)2ஹg=------------------------------------=--------------h஺,88ᡠ?ijklmnᦪgb,ᨵ22:O஻>o,b>o,p/=2,ᡠ?1=/+[2(q±஽)3,22ᓽa+bW2,(?aᶍ)278tᎷpa+ᓃ>2,ᑣa3+b3=(a+b)(a2—ab+b2)=(a+b)[(a+b)2—3ab]>(a+b)ab>2ab,ᡠ?a஺V1,Xa3+b3=(a+b)\_cT-ah+lr~\=(a+h)[(a+h)?—3஻b]>2(2^—3ah):Ol+b3=2,ᡠ?2>2(4—3x?)#:yx?>1,z{|}#ᦑa+/?W2(?aᶍ)19ᙠnᐵḄᵨ#L^ᦪḄ⌕ᐹ#ᡠ?^ὃᦪ⚪Ḅ#Ḅᵨl#᝞ᦪḄ¡¢ஹ£¢#¤ᦪḄ¥£§#ὃ¨⚪i]⌕©#ªªhᦪᭆ¬#ᱯ®^¯°ᦪஹᢣᦪᦪஹiᦪᦪᨵᐵᭆ¬ឋ³´ᑗὶ·#¸`ᔊºὃ⚪»¼#ᐵ]Ḅᑁ¾ºº¿ᨵ#ᨵḄ^ÀÁὃÂ#ᨵḄᑣ^ÃÁὃÂ.ÄÅ(ਭਭਭਭ)ᐵ]XḄǯ2>13r1).x-2ᫀÉÊË[É1]Ìᓻ)^¡ᙠ[-1,ÎÏḄ᜻ᦪ#PÑ1)=1,Ò"ஹ"GL-1,Î#Ó+Ô0ÕÖ213>0.m+n(1)ᵨ¡7×/U)ᙠ[—1,1]Ï^Øᦪ(2)¯)2x-\(3)ÒKx)W*—2af+1iᡠᨵxe[—1,1],[-1,1]ឤᡂ5#nᦪ#Ḅ¥£§.⚪kÚÛ⚪^9⍝ᦪhÝᔠḄ⚪»#ὃÂḄᑖ᪆áâhᓄäáâ#åਭਭਭਭਭæ⚪».çèᡲÛ⚪ê⌕ëìᦪḄᓫîឋh᜻Ꮤឋ#ᓫîឋðñòó#ôᡠõ⚪ᑖöᓄ#^ᦪḄ÷õ⚪õ⚪Ḅ⌕Ḅ¿^øùḄ¥£§#Ḅúûüᑮþᐵÿᵨ.┯ᑖ᪆(2)ᑭᵨᓫឋᓄx+,G[-1,1],-Le[-I,1]2x—1ា᧕ᶍḄᙢ#.ᢈ%&#'(1)ᓫឋḄ()ᑭᵨ᜻Ꮤឋᮣ-./0ᵨ12ᩩ4ᐵ6(3)ᑭᵨᓫឋ740ᓄᡂ“1”9:;<.

26(1)()ABC10,jᵫMMVO,kM%•Wi)-/l^)<0,ᓽpq)ᙠs-1,tuvwᦪ.(2)=y)ᙠs—1,1auvwᦪ,-I0,ᑖQìÒÓñò஻ḄB¡¨.ªy(x)=x2—2ô+஺+2,ᨵ4=(—2a)2—(44+2)=4(஻2—஻M2)(1)ö/VOஹMlVaV2,M=0;[1,4](2)ö/=0a--1ᡈ2.öa=-1M={—1}[1,4]Üöa=2m={2}^[1,4].(3)ö஻>0,aV—lᡈa>2.ª#å)=0Ḅ÷᪷X],øDᓽீúûM=[x]/প>0,D/(4)>0aMqs1,4a=KIீMW4O1<«<4,J1A>OM஺+3>018—7஺ு0,,D18ᓽý2V“V—a>07a<1ᡈ஻>2

27AMc[1,4]aḄ!"(1,—).7•┶(ᝯ*+,-./0Ḅ12ᓄ4,56ᓄ78ᨵ:;Ḅ⌕=>Ḽ;ὃA⚪Cᑣᔣ78FGḄHI6ᓄ.+,-ḄὃJKLM"NO+,-◤⌕QGR☢TUV⚪(1)WXYZᐗ\+,-(]^ᐗ_\+,-(])Ḅ`.(2)YZᵨbc᪗᪷`;\+,-fᑖ-+,-ᱯi⌕QGj-Ḅᜐᳮm`.(3)YZoᳮ+,-ḄpqrsḄ,5t-ᢣᦪf.ᦪ+,-ḄTqwxrsḄ`.(4)YZyz.+,-ḄTqwxrsḄ`.(5)ᙠ+,-Ḅ}~⌕ᐙᑖ1ᵨḄᑖ᪆78C+,-,5ᙢ6ᓄ᧕Ḅ+,-.(6).yḄ+,-⌕7ᢥ᯿Ḅᑖr᪗Hᑖr.OXஹ⌱⚪(x+l)2(x<-l)1.(ਭਭਭਭਭ)¡¢ᦪ/(>)=«2%+2(-lvxvl),¨©ª)>1,ᑣ஻Ḅ!"()--l(x>l)1ஹA.(-8,—2)U(-+8)B.(——,5)2C.(-8,-2)U(-1,I)D.(—2,——)U(],+8)2_ஹ®¯⚪2.(*****)¨©/)ஹg(x)²"᜻¢ᦪ´x)>0Ḅµ"(a2,b),g(x)>0Ḅµ"(g,g),·IJ/U)•g(x)>0Ḅµ".3.(*****)¨©ᐵºḄm~sin2x+2cosx+6z=0ᨵᑣaḄ!".pஹÀ⚪4.(ਭਭਭਭਭ)¨©〉ᔠ+,-Ã4x+pl+lr—3Æ5ḄᜧḄᨬᜧ3.(1)=pḄÉ(2)Ë/(x)=d_!■ᐵXḄ+,-fT(x)>log1±±(kCR+)px+1k75.(*****)¡Õ)=᝖2+ªÉ+ḄË×)=3,V"ᔲÙᙠbஹc£R,Û+,-1Qx2+1W/U)W2?+2x+1.ᑗßᦪX²ᡂFáâãḄä.6.(*****)¨©¢ᦪ/(82+஻1+%.åG஺£R,ᨵ/(sin6)W0,æ.Asin஺+2)22.প=pஹqéêḄᐵë-É(2)=஻Ḅ!É(3)᝞íᜧsin+2)Ḅᨬᜧ"14,=pḄ,î=ïðsinJ)Ḅᨬ´.

287.(ਭਭਭਭ)+,-logjx——)>1X8.(****ò¡¢ᦪÕ)=a'ôõᩩ÷:ùú£(—8,0)/)>1Éùx£(0,1û,+,-üý1)ᑑ(l+mx—f)>ᜧ஻2+2)ឤᡂᦪmḄ.ὃᫀ!"#$%ᓄ'.T)"(2-">>o,x—2ᓽ/(a-l)x+(2-a)2(x-2)>0.4a>\5!"#$6஺8^~~-)(%—2)>0<.a-latuv2,ᓽ0Waa-1a-115!"#$Ḅ'(88,K2)U(2,+8).a-l4஺VI5A஻V0,N'(BC2)@AOVQVI,N'(2,K2)a-la-ln—2(1—2OPᡠR4஻>15N'(88,——)U(2,+8)@4OV஻V15N'ফ——)@a-la-l4஺=05N'0@4஺<05N'(BC2).a-1UVWX8ஹ1.᪆ᵫ/U)]ᜧ஺)>1%^a>\a<-\-112஺+2>1——1>1জ^aV—2,ঝ^8V஻V1,ঞ^cW02daḄH(88,-2)U(-i,1)2ᫀC—•ஹ2.᪆:ᵫijᱥ>஺2.../),g(x)ᙳ'᜻oᦪ.•./(x)<0ḄNH(8p-a2),g(x)V0ḄNH(8.ᵫ/)•g(x)>0%^a2஺ᡈ/W<0ᓽa2ba2g(x)>0[g(x)<0—

29ᫀ(஻2,—)U(——,—a2)223.᪆!st%ᓄ'cos82cos%8஺-1=0,uz=cosx,^v82%—1=0,!w⚪yᓄ'stz82L஺-1=0ᙠ[ߟ1,1]P}~ᨵ8᪷.u஻)=82L஺-1,r=Lᑖ᪆%^^[—2,2].ᫀ[-2,2]ஹ4.(1)@〉ᔠ"#$Ix2—4x+pl+k—3IW5ḄxḄᨬᜧ'3,••ᐗ—3W0,Lx_31=3—%.A84x+pl=-f+4x—p,ᑣ!"#$'/83x+p+220,ᐸN"%'xlxW3ḄN,Lx2—4x+p\=x2—4x+p.,•!"#$'4x+p+3—xWO,ᓽ/—5x+p—2W0,ux—5x+p—2=(x—3)(x—m),%^zn=2,p=8.8'-]1+x(2y(x)=—,!.f1(X)=log8-----(—1k>g81+**,•log(1—x)=-1,ᵫᐔr)<2f+2R+8^222223K1).1333ᵫ$᜜Bvᓝ•^-,\/(—1)=],Z?+c=-1-,ᦑ5592(஻+c)=5,a+c=b=1,•\f(x)=ax~+x-^(——a),⚪ax2+x+(——a)2f+J■-8ᑗx£Rᡂ22...aWl/=1—4(஻81)(28஻)W0,^(2஺-3)240,3o2•^f(x)=-x+x+iaa᧕¤¥d¥+C+1ᡈ2?+2%+d§ᡂ.22aτa¨ᙠᦪa=-,61,c=1,©^"#$x2+-W/(x)<2/+2x+-8ᑗxGR§ᡂ.6.(I)—iWsinW1,iWsin+2W3,ᓽ4xC[—1,1]5ᜧx)W0,4[1,3]5d4x=l5/U)=0:.l+p+q=0,!.q=-(l+p)(2)f(x)=x2+px—(1+p),4sin=—15A—l)W0,1—p—1—pWO,@.p20

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