z=0是函数(z)=dfrac (z)(sin {z)^2cdot ((e)^z-1)}的几级极点A 1 B 2 C 3 D 4

1.下列函数有些什么奇点?如果是极点,指出它的级数:-|||-(1) dfrac (1)(z{({z)^2+1)}^2} ;-|||-(2) dfrac (si

1.求下列函数的留数:-|||-(1) (z)=dfrac ({e)^z-1}({z)^5} 在 z=0 处;-|||-(2) (z)=(e)^dfrac (1

1.下列函数有些什么奇点?如果是极点,指出它的级:(1)(1)/(z(z^2)+1)^(2); (2)(sin z)/(z^3); (3)(1)/(z^3)

[ dfrac (sin z)({z)^2},0] =-|||-A 1-|||-B .-1-|||-C dfrac (1)(2)

设C为正向圆周|z|=2, 则下列积分值不为0的是( )A.int dfrac (z)(z-1)dxB.int dfrac (z)(z-1)dxC.

4.设 (z)=dfrac (1)(z)-zsin dfrac (1)({z)^2}, 则 [ f(z),0] =-|||-(A)1; (B)2; (C)0;

(z)=(3+dfrac ({z)^2}(2))sin z在z=0处的展开式中(z)=(3+dfrac ({z)^2}(2))sin z的(z)=(3+dfra

计算(int )_(c)_(c)dfrac (cos z)((z-dfrac {1)(2))(z-1)}dz，其中(int )_(c)_(c)dfrac (co

1.将下列各函数在指定圆环内展为洛朗级数.-|||-(1) dfrac (ln (2-z))(z(z-1)) lt |z-1|lt 1;-|||-(2) dfr

z=1是函数f(z)=(tan(z-1))/(z-1)的(）A. 极点;B. 本性奇点;C. 可去奇点;D. 一级零点;