導(dǎo)數(shù)與微分習(xí)題課-資料下載頁(yè)
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【正文】 y).(,)2()( xfxxxxf ??? 求設(shè)例 4 解 先去掉絕對(duì)值 ,2),2(20),2(0),2()(222??????????????xxxxxxxxxxf,0時(shí)當(dāng) ?x ,0)0()0( ???? ?? ff 。)0( ??f,20 時(shí)當(dāng) ?? x。43)( 2 xxxf ??? ,02 時(shí)或當(dāng) ?? xx。43)( 2 xxxf ????,2時(shí)當(dāng) ?x2)2()(l i m)2(2 ??????? xfxffx 2)2(l im 22 ?????? xxxx.4??2)2()(l i m)2(2 ??????? xfxffx 2)2(l im 22 ????? xxxx .4?),2()2( ?? ??? ff .2)( 處不可導(dǎo)在 ?? xxf???????????????,20,43,0,00,2,43)(22xxxxxxxxxf或.,)(s i n c o s yxxy x ?? 求設(shè)例 5 解 )(ln ??? yyy)s i nlnc o s(ln ??? xxxy)s i nc o ss i nlns i n1()( s i n2co sxxxxxxxx ????.,114 )(22nyxxy 求設(shè)???例 6 解 1 3441 14 2222???????xxxxy )1111(234????? xx,)1( !)1()11( 1)( ????? nnnxnx? ,)1(!)1()11(1)(????? nnnxnx].)1( 1)1( 1[!)1(23 11)( ?? ?????? nnnn xxny
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