【正文】
xxbaxxf則處可導(dǎo),在設(shè) 1112c os21)(.2 ?練習(xí)一:.____)(,3)()(,??????????xfxxxfxxfx則無窮小高階的為比時當(dāng))(1132)(.3 32xfxxxxxf ????????? ,求設(shè).____,ar c s i n)(),2323(.404 ???????xdxdyxxfxxfy221a r c t a n.1.??????????xxxydxdy等:求導(dǎo)數(shù)二3221xxy???xxy 2a r c c os2 )1(.5 ??xxxxxy ta nln )c os(s i n.3 32 ??yxexy ?? )(2)1(ar c xfexfy ?dyxt xtxy tt求,)( ????