【導讀】)(xf?=y(tǒng)?)()(limlim00. a)Findy?x?0lim. pointB(x,f(x)).TheslopeofchordAB=axafxf??NowasB?A,x?aandthe. slopeofchordAB?slopeof. tangentatA.ax?)()(limis)(af?x=a.)(xf)(xf?nx1?nnx. xcosxsin?2cos1sec?)()(xvxu?)()(xvxu???)()(xvxu)()()()(xvxuxvxu???)()(xvxu2vvuvu???)0(?v. If)(ufy?where)(xuu?thendxdududydxdy?)()(xgexf?)()()(xgexfxg???)(ln)(xgxf?)()()(xgxgxf???)(ln)()(ln)()()()(xuxvxuxveexuxfxv???])()()()(ln)([)()(ln)(xuxuxvxuxvexfxuxv?????dydxdxdy1?])([1)(1????xfxf. .,xyarcsin?,yxsin?.,)(ty??,)(tx??→)(1xt???,)]([1xy????Implicitfunction:0))(,(?xyxF,0))(,(?xfxF.0-222??ayx,taytaxsincos??,t]2,0[??)()(lim)(02. n???????y=sinx)2sin(cos?????xxy. )2sin()(????nxyn. f(x)isincreasingonS?0)(??xfforallxinS,and. f(x)isdecreasingonS?0)(??xfforallxinS.Find)(xf?,andxwhichmake0)(??xf,wherenabx???Wenotethatas??n,???Wewrite????If0)(?xfforallxon[a,b]then. badxxf)(istheshadedarea.babadxxfdxxf)()]([. babadxxfcdxxcf)()(,cisanyconstant. cabacbdxxfdxxfdxxf)()()(. )()()()(aFbFxFdxxfbaba????,where??dxxfxF)()(. aadxxf0)((f(x)odd),????aaadxxfdxxf0)(2)((f(x)even). If0)(?xfonbxa??then??b. If)()(xgxf?onbxa??then???b. baavedxxfabf)(1. If)()(xfxF??,then???CxFdxxf)()(. Formulas:?????Cxndxxnn111,Caadxaxx???ln1. Cxinxdxcoss,???Cxxd