初中三角函数值表特殊角三角函数值sin0=0sin30=0.5sin45=0.7071=√22sin60=√32=0.866sin90=1cos0=1cos30=√32=0.866cos45=√22=0.70cos60=0.5cos90=0tan0=0tan30=√33=0.577tan45=1tan60=√3=1.732tan90=无cot0=无cot30=√3=1.732cot45=1cot60=√33=0.577cot90=0（2）0°～90°的任意角的三角函数值，查三角函数表。（见下）（3）锐角三角函数值的变化情况（1i）锐角三角函数值都是正值（ii）当角度在0°～90°间变化时，正弦值随着角度的增大（或减小）而增大（或减小）余弦值随着角度的增大（或减小）而减小（或增大）正切值随着角度的增大（或减小）而增大（或减小）余切值随着角度的增大（或减小）而减小（或增大）（iii）当角度在0°≤α≤90°间变化时，0≤sinα≤1,1≥cosα≥0,当角度在0°<α<90°间变化时，tanα>0,cotα>0.附2：三角函数值表sin0=0,sin15=（√6-√2)/4,sin30=1/2,sin45=√2/2,sin60=√3/2,sin75=(√6+√2)/2,sin90=1,sin105=√2/2*(√3/2+1/2)sin120=√3/2sin135=√2/23sin150=1/2sin165=（√6-√2)/4sin180=0sin270=-1sin360=04sin1=0.01745sin2=0.034899sin3=0.052335sin4=0.069756sin5=0.087155sin6=0.104528sin7=0.121869sin8=0.139173sin9=0.156434sin10=0.173645sin11=0.19080sin12=0.20791sin13=0.22495sin14=0.24192sin15=0.25881sin16=0.27563sin17=0.29237sin18=0.30901sin19=0.32556sin20=0.34202sin21=0.35836sin22=0.37460s6in23=0.39073sin24=0.40673sin25=0.42261sin26=0.43837sin27=0.45399sin28=0.46947sin29=0.48480sin30=0.49999sin31=0.51503sin32=0.52991sin33=0.54463sin34=0.55919sin35=0.57357sin36=0.58778sin37=0.60181sin38=0.61566sin39=0.629327sin40=0.64278sin41=0.65605sin42=0.66913sin43=0.68199sin44=0.69465sin45=0.70710sin46=0.71933sin47=0.73135sin48=0.74314sin49=0.75470sin50=0.76604sin51=0.77714sin52=0.78801sin53=0.79863s8in54=0.80901sin55=0.81915sin56=0.82903sin57=0.83867sin58=0.84804sin59=0.85716sin60=0.86602sin61=0.87461sin62=0.88294sin63=0.89100sin64=0.89879sin65=0.906309sin66=0.91354sin67=0.92050sin68=0.92718sin69=0.93358sin70=0.93969sin71=0.94551sin72=0.95105sin73=0.95630sin74=0.96126sin75=0.96592sin76=0.97029sin77=0.97437sin78=0.97814sin79=0.9816210sin80=0.98480sin81=0.98768sin82=0.99026sin83=0.99254sin84=0.99452sin85=0.99619sin86=0.99756sin87=0.99862sin88=0.99939sin89=0.99984sin90=1cos1=0.99984cos2=0.9993911cos3=0.99862cos4=0.99756cos5=0.99619cos6=0.99452cos7=0.99254cos8=0.99026cos9=0.98768cos10=0.9848cos11=0.9816cos12=0.97814cos13=0.9743cos14=0.9702cos15=0.9659cos16=0.961212cos17=0.9563cos18=0.9510cos19=0.9455cos20=0.9396cos21=0.9335cos22=0.9271cos23=0.9205cos24=0.9135cos25=0.9063cos26=0.8987cos27=0.8910cos28=0.8829cos29=0.874613cos30=0.8660cos31=0.8571cos32=0.8480cos33=0.8386cos34=0.8290cos35=0.8191cos36=0.8090cos37=0.7986cos38=0.7880cos39=0.7771cos40=0.7660cos41=0.7547cos42=0.743114cos43=0.7313cos44=0.7193cos45=0.7071cos46=0.6946cos47=0.6819cos48=0.6691cos49=0.6560cos50=0.6427cos51=0.6293cos52=0.6156cos53=0.6018cos54=0.5877cos55=0.5735cos56=0.5592cos57=0.5446cos58=0.529915cos59=0.5150cos60=0.5000cos61=0.4848cos62=0.4694cos63=0.4539cos64=0.4383cos65=0.4226cos66=0.4067cos67=0.3907cos68=0.3746cos69=0.3583c16os70=0.3420cos71=0.3255cos72=0.3090cos73=0.2923cos74=0.2756cos75=0.2588cos76=0.2419cos77=0.2249cos78=0.2079cos79=0.1908cos80=0.173617cos81=0.1564cos82=0.1391cos83=0.1218cos84=0.1045cos85=0.0871cos86=0.06973cos87=0.052cos88=0.0348cos89=0.0174cos90=0tan1=0.017455tan2=0.034920tan3=0.052407tan4=0.069926tan5=0.087488t18an6=0.105104tan7=0.122784tan8=0.140540tan9=0.158384tan10=0.17632tan11=0.19438tan12=0.21255tan13=0.23086tan14=0.24932tan15=0.26794tan16=0.28674tan17=0.30573tan18=0.32491tan19=0.34432tan20=0.36397tan21=0.38386tan22=0.40402tan23=0.4244719tan24=0.44522tan25=0.46630tan26=0.48773an27=0.50952tan28=0.53170tan29=0.55430tan30=0.57735tan31=0.60086tan32=0.62486tan33=0.64940tan34=0.67450tan35=0.70020tan36=0.72654tan37=0.75355t20an38=0.78128tan39=0.80978tan40=0.83909tan41=0.86928tan42=0.90040tan43=0.93251tan44=0.96568tan45=0.99999tan46=1.03553tan47=1.07236tan48=1.11061tan49=1.15036tan50=1.1917521tan51=1.23489tan52=1.27994tan53=1.32704tan54=1.3763tan55=1.42814tan56=1.48256tan57=1.53986tan58=1.60033tan59=1.66427tan60=1.73205tan61=1.80404tan62=1.88072tan63=1.96261tan64=2.05030t22an65=2.14450tan66=2.24603tan67=2.35585tan68=2.47508tan69=2.60508tan70=2.74747tan71=2.90421tan72=3.07768tan73=3.27085tan74=3.48741tan75=3.73205tan76=4.01078tan77=4.33147t23an78=4.70463tan79=5.14455tan80=5.67128tan81=6.31375tan82=7.11536tan83=8.14434tan84=9.51436tan85=11.4300tan86=14.3006tan87=19.0811tan88=28.6362tan89=57.2899tan90=无取值24
