文档介绍：1Chapter1Functions(函数))AfunctionfisarulethatassignstoeachelementxinasetAexactlyoneelement,calledf(x),)ThesetAiscalledthedomain(定义域))Therange(值域)offisthesetofallpossiblevaluesoff(x)asxvariesthroughoutthedomain.??)()(xgxf:Note1)(,11)(2?????xxgxxxfExample)()(xgxf??(基本初等函数)1)constantfunctionsf(x)=c2)powerfunctions0,)(??axxfa3)exponentialfunctions1,0,)(???aaaxfxdomain:Rrange:),0(?4)logarithmicfunctions1,0,log)(???aaxxfadomain:),0(?range:R5)trigonometricfunctionsf(x)=sinxf(x)=cosxf(x)=tanxf(x)=cotxf(x)=secxf(x)=cscx6)inversetrigonometricfunctionsdomainrangegraphf(x)=arcsinxorx1sin?]1,1[?]2,2[???f(x)=osxorx1cos?]1,1[?],0[?f(x)=arctanxorx1tan?R)2,2(???f(x)=otxorx1cot?R),0(?,positefunction(复合函数)gf?isdefinedby))(())((xgfxgf??Note)))((())((xhgfxhgf???2ExampleIf,2)()(xxgandxxf???????))))))(())(()xgfxgfa??Solution)2(xf??422xx????]2,(}2{:domain???orxxxxgxfgxfgb????2)())(())(()?]4,0[:02,0domainxx???????4)())(())(()xxxfxffxffc?????)[0,:domain?xxgxggxggd??????22)2())(())(()?]2,2[:022,02??????????(初等函数)binations(addition加,subtraction减,multiplication乘,division除))9(cos)(2??xxFisanelementaryfunction.)))((()()(cos)(9)(2xhgfxFxxfxxgxxh?????2sin1log)(xexxfxa???Exampleisanelem