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(90120)(330)1ABCC90tanA512sinB()A.513B.1213C.512D.1252y(x2)23()A(23)B(23)C(23)D(23)3OABACAOB122AOC()A122B120C61D584sin(20)32()A20B40C60D805y(x2)2()ABA(20)Cx2Dyx6()AC(CDAD)12AC35BCBAAB10BC()A5B6C8D(35)7()ABCDOO2B135AC()A2BC.2D.38()OABOCABDOACB()AADBDBODCDCCADCBDDOCAOCB9yx2bx3yx2(b1)x3()10A2OOAPlAOBAPB60OPxPAByx()(432)11BAC66tanBAC____________.12yx2bxc(12)bc____________1315/BA3020C____________(31.7320.1)14()yx22x1A(03)____________15ABOCDABAC22BC1cosABD____________16ABC23OBAC45____________()17ABCAB6OABCAACBA1/O3ABC____________18()xACy1x2(x0)y2x23(x0)BCCyy1DDEACy2EDEAB____________.(58)19(8)O3AB4.sinA20(8)ya(xh)2k(a0)x11.(1)(2)________________________________________________y0.21(10)()ABOCDABEPOPBCDFPBCC.(1)CBPD(2)PBC22.5OR2AC22(10)()APQP456mBPQ6030.(1)BPQ(2)PQ(1m31.721.4)23(10)ABOBCODOCDCBCDBAE.(1)CDO(2)C2DBE(3)EAAO2()24(12)()yax2bxc(a0)(423)yC(02)xAB(AB)(1)AB(2)(1)lPAPCPAPCP(3)ABMCEMECExDCE1B2.A3.A4.D5.D6.A7.B8.B9.C10.D11.3212.113.1.814.yx22x315.1316.343217.418.3319OOCABCACBC.AB4AC2.RtAOCOCOA2AC232225.sinAOCOA53.20(1)x11ya(x1)21.(01)2a10.a1.y(x1)21.(2)(11)x10x221(1)OCOD.PBCPDCPBCBCDBCDPDC.CBPD.(2)ABOCDABBCBD.PBCBCD22.5BOCBOD2BCD45.AOC180BOC135.lAC135218032.22(1)BPQ906030.(2)PQABC.PQxQBQPxBCQBCxcos3032xQC12x.ACPCACP632x12xx.x236.PQ2369PQ9m.23(1)OD.BCOABC90.CDCBCBDCDB.OBODOBDODB.ODCABC90ODCD.DOCDO(2)DOEODBOBD2DBE(1)ODECDECEDOE90.CDOE2DBE.(3)OFDBFAD.EAAOADRtODEADAOOD.DOA60.OBD30.OBAO2OFBDOF1BF3.BD2BF23BOD180DOA120.SSOBDSBOD1202236012231433.24(1)ya(x4)223(a0)C(02)a(04)2232.a16.y16(x4)223y16x243x2.y016x243x20.x12x26.A(20)B(60)(2)(1)lx4ABlCBlPAPBP.APCPBCB(60)C(02)OB6OC2.BC6222210.APCPBC210.APCP210.(3)ME.CEOCEM90.CODDEM90.OCME2ODCMDECODMED(AAS)ODEDDCDM.ODxCDDMOMOD4x.RtCODOD2OC2CD2.x222(4x)2.x32.D(320)CEykxb(k0)CEC(02)D(320)b232kb0.k43b2.CEy43x2.