【正文】
y=|x| O x xyo)(xfy ?xy2xy?0 xy? y y=f(x) O x 例 9 0 1 1/π - 1/π xy. 0 ,0,00,1s i n)( 處的連續(xù)性與可導(dǎo)性在討論?????????xxxxxxf?? )(lim 0 xfx? )0(f?xxx1s i nlim0?.0)( 處連續(xù)在 ?? xxfxxxxyxx ?????????????001s i n)0(l i ml i m00?xx ?? ??1s i nl i m0.)( ?也非不存在. 0 )( 處不可導(dǎo)在 ?? xxf解 0?*例 10 .0 )的導(dǎo)數(shù)(常數(shù)求 ???x時,當(dāng) 0 ?xxxxxxx ??????????? )(l i m)(0解 xxxxxx /1)/1(l i m01??????????ttxtxxt 1)1(lim01/ ?????????ttttxtt???? )1l n (lim)1l n (1)1(lim001 ?????????)1l n (lim)1l n (1)1(lim01)1(0 vvttvtvt ?????????????,1?ttt?)1l n (lim0??而 tt t /10 )1ln (lim ?? ?? ,??.)( 1???? ?? ? x