初中数学复习:锐角三角函数经典总结

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1ABCCAAAsinAAAcos.AAAAcossin.ABCaACbABccaAsincbAcos2A1sin0A1cos0AA2130sin2245sin2360sin2330cos2245cos2160cos00900sincos(1)ABCRtAAAtanAAAtanbaAtan3330tan145tan360tan)90sin(cos),90cos(sinAAAAAA90cottanAA90tancot1cossin22AAAAAcossintanAAAsincoscottanacota=1b1.30sin30cos___________2.sin21cos3.21sin900=_______23sin=__________4_________cos,,60,90,BACABCRt5ABC_________cos,5,3,90BABACC6_________sin,5,3,90,AABBCCABCRt7ABCRt90Cba33A=_________Asin=_________8ABCRt2A9ABC0cos2322sin2BAABC10.1154sinsin22254cos)90cos(1121cos37cos41sin46cos_____________________12ABC90C51cosBB2sin=________1330cos30sin22__________________18sin72sin2214341522)31(45tan60sin16_________,1,2tan,,baBRtCABCRt1764221218ABCRt90C3cotA2tansincotCBA____________19.90BAAAtan_____sinBAcos______sinAAAtan_____cossin20RtABC90CBAtantanADEBC2145sin30cos45cos30sin2230cos30sin45sin2260sin2123)45cos60)(sin45sin30)(cos45sin230sin2(24.21+12+2sin6060tan11ABCDRtACBABCRt,,DAD4,54sinACDCDBC2sin23______sin33;cos67.5_________cos76.533090cos123cos)cos(cos241sin40sin22=_________554sin,51cos,90nBACABCRtn___________6,cossin,cossinnmmnAnmB12nnC122nmDnm2127RtABCC=90oAC=6DACtanDBA=51AD()A.2B.3C.2D.18ABCDABADAB=aANDABDMANMCNANNDM+CNa()AaBa54Ca22Da239ADABCtanB=43,aNMCDAB8ACEAE:CE=2:3tanADE10ABCDAEBCEBC=1cosB=135,11ABCRt90C5cbax0222mmxxABCRt.12ABCADBCtanB=cosDAC1AC=BD2sinC=1312,BC=12AD14BCDBACBABCRt,53sin,9045ADCDC=6.BADBECDAABCDADCB[]1PAOBOAPMPNOBMNMPN=AOB=MPNPPMPOMPNMNOBOM=xON=yyx0POMSsin=oP=21MPN30OPM=30N2OPNPMN3yx4SxS22ABCDADBCC=90BC=16DC=12AD=21PDDA2QCCB1BPQDCQBPt1BPQSSt2tBPQ3PQABO2AO=OBBQP4tPQBDt3ABCDABxCDDy.CBy=43x+163AD4004.PAAB.QBBCD1..PtOPQsOPQ.1BC2st3ts.4OABCD0CEOADEOABFtanBFD=34OAx27x8=02AB=30A(1)BF(2)ED(3)EDFDMNCDMNMOxyABCDPQ65ABCDD=BCD=90B=60AB=6AD=9ECD(ED)EEFACADF(ECEFAC)DEFEFDGDE=xGEFABCDy(1)CD1(2)GBCx(3)yxxy??(25)ABCDEFG1

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