2016901610()lim()xxfxgx0lim()xxgx2na1lim()0nnnaalim0nna3()fx(,)ab()fx(,)ab4()fx[,]ab()fx(,)ab()0fx2dttdttxxxtan0sin00sintanlim63)(00cossin1)(2xfxxxxxexfx64()fx[,]ab12,,,nxxx(,)ab.:(,)ab211()(21)()nkkfkfxn.65xxxx3sin2tan2066nn67dxx2cos68dyyxfdxdyyxfdxIxxxx224222042202,,I79sincossinsincos,1,;(2),xRyRzRRzzxyxy(8)10120ln(1)(1)xdxxx(15)12601,)1002cos2()2sin(dyyedxyyexlxl10-10-10102)(xf[a,b]a,b(a,)(af)(b,)(bf))(xfy(c,)(cf),acba,b0)(,f3),2,1(,1,11212ndxxanannnnnnna11)1()ln1211(limnnn4)(xf[0,1]0)1(f),2,1()()(nxfxxgnn[0,1]5a2222220zzzxxyy,xy,uxyxay,u220zu1a