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201.ABCABCcba,,Aacbsin)(222.cos3AbcACBcoscos2,ABCD,13AB,ABC25ABCS,3cos5DAC,120ACAB,:(1)AC;(2)cosBAD3.cos212cos2sin)(xxxxfIf(x)IIxxfx2cos,523)(),4,4(.4.2()sincos3cosfxxxx()fx()fx,625.aRaaxxxf,.(2sin3cos2)(21Rx)(xf2)(xf[,]66332)(xfxysin6.)1),6cos(2(),sin2,1(xbxa)()(Rxbcxf1)(xf2)32cos(,58)(xxf7.ABCa,b,cABCm=23sin2B23n=sin2B+21mn=3.1B;2Ba=6,SABC=63,b.8.ABCABC(1,3),(cos,sin),mnAA1.mn1A2221sin23,tansincosBCBB9.ABCABCabcacbca21222BcosBCA2cos2sin2.10.ABCABCabccos(2)cos.bCacB1B222coscos,yACy.11.ABCDBCDABAD=1BAD=ABCDS.(I)S()S12.ABCABCabcabbac2223tantan(1tantan)3ABABB(sin,1)mA(3,cos2)nAnm13.333()sincos(0),22fxxxxR21)(xf)(xfx2)124(af=59asin14.xxxxfsinsincos2cossin2)(2(0x.(1);(2)ABC,a,b,cA,B,C,a1,2b,23)(Af,C.15.(3sin,cos),(cos,cos)axxbxx,()21fxab(1)()fx;(2)[,]62x,()1,fxx16.3sin6fxx(0,)xR20fw_ww.k#s5_u.co*mfx17.)cos3,(sinxxa)cos,(cosxxbbaxf)(1bax2)(xf18.ABC1tan4A3tan5B1C2ABC1719.2111()3cossincos222fxxxx)(xfkxA)sin((00)2()fxx3633()52fcos220.(sin(),1),(cos(),3),44mxnx()fxmn1//mn()fx2()fxm0m3()gxm1.bcacbA2cos22223sinA220A3A4ABC,32CB,3263,26BB6BBBBCBcos21sin23)32cos(coscoscos)6sin(B8CBcoscos]1,23(102.)2(50sin13)1(120cos13CABACCABAC22)2()1(10AC1312cosCAB3cos5DAC135sinCAB54sinDACDACCABDACCABBADsinsincoscoscos6516103.xxxxxfcos211cos2cossin2)(2)4sin(2cossinxxx4)(434),(20cos2ZkkxZkkxx6}22|{)(yyxf7.523)4sin(2,523)(xxf53)4sin(x824044xx54)4cos(x102524)4cos()4sin(2)4sin(2)22sin(2cosxxxxx124.2()sincos3cosfxxxx132sincoscos2122xxx133sin2cos2222xx33sin232x5()fx22T662x40233x3sin2123x933230sin213222x()fx,622320125.1.2sin3cos2)(2axxxf=12sin32cosaxx=1)62sin(2axT=42[,]2[,],66662xxmaxmin33yyaa0a83()sin()sinfxxfxx66()sinfxx1226()2sinfxx226126.1xxbaxfsin2)6cos(2)(2xxxsin26sinsin26coscos2)3sin(2sincos3xxx4,223322kxk,26726kxk)(xf)(],267,26[Zkkk621).3sin(2)(xxf54)3sin(,58)3sin(2xx8.54)6cos()6cos()3sin(xxx.2571)6(cos2)32cos(2xx127.1mn=3mn=23sin2Bsin2B+2+23=323sin2Bcos2B=232sinB=214B=6B=6562BB=6S=21acsin=63c=439b2=a2+c2-2accosB=36+48-264323=12.b=23128.1(1,3),(cos,sin),1mnAAmncos3sin1AA21sin().62A45,,666663AAA62sincos3,sincosBBBBtan1cos0,3tan1BBB8tan2B9tantan(())tan()CABABtantan,1tantanABAB1132853tan.11123C129.1412cos222acbcaB221cos21cos22cos2cos2cos2sin222BBBBBCA10=-411210.()BCBACBcossincossin2cossin2BACBcossin2)sin(0A,sin0A,21cosB3B.4()()3422CACAy22coscos)2sin232cos21(211)]234cos(2[cos21122cos122cos1AAAACA)62sin(211A,63420A,67626A81)62sin(A,3Ay121011..()ABDcos222BD,ABDBCDSSS=sin)cos22(21sin21333sin()32S0,)5,02333.7231S6523.1012.2222221cos(0)223abccababCCCab213tantan(1tantan)3ABAB33)tan(BA63232BABA4432BBA62nm3sincos2AA23172(sin)48A8]1,0(sin)32,0(AAnm8171013.()6sin3cos21sin233xxxxf.)(xf2224.)64sin(3)(xxf.44262xk212kxmax3y.xZkkxx,122.8()()3sin[4()]4124126f)2sin(3a3cos93cos53cos5.102234sin1cos1()55.1214.:(1)xxxxfsinsincos2cos1sin2)(sinx+sinxcos+cosxsin-sinxsinxcos+cosxsinsin(x+).f(x)x,sin(+-1,sin1.02.(2)(1)xxxfcos)2sin()(.23cos)(AAf,AABC,6A.22sinsinaAbB,ba,4B43B.4B,C-A-B12746;43B,C-A-B12436.,127C12C.15.(1)2()23sincos2cos1fxxxx13sin2cos2xx22sin(2)6x.4()fx.6(2)()1,fx1sin262x.8[,]62x72[,]626x5266x103x16.12360sin3)0(f3222T)64sin(3)(,4xxf6394125f59)2sin(354sin,53cos.1217.1ba0babaxxx2cos3cossin2232cos232sin21xx402332sinx6kx23432kx2332kx2k3Zkkkxx,3282baxf)(2332sinx22T10xxfsin)(22,22kk223222kxk1212125kxk]12,125[kkZk1418.1()CAB1345tantan()113145CAB20C34C4234CAB17AB6tantan0ABABABC822sin1tancos4sincos1AAAAA02A1017sin17AsinsinABBCCAsin2sinABCABC2BC1419.:2111()3cossincos222fxxxx1cos13sin22xx23sin()32x4232xkkZ=526xkkZ=5()fx3126232xkkZ=26xkkZ=7()fx3128333()sin()3252f3sin()35360324cos()359224sin(2)2sin()cos()33325227cos(2)2cos()133251022cos2cos[(2)]332222cos(2)cossin(2)sin33332437501220.//mn3sin()cos()44xx22223(sinco2222xxxx3sin3cossincosxxxx2sin4cos,tan2xxx221()sin()cos()3(sincos)3442fxxxxx2222221sincos1tan11333()313.2sincos2tan12510xxxfxxxx21()cos232fxxm(0)m1cos2()32yxm31()cos2()2gxxm()gx2,()224kmkmkZ0m12k1km4