4.不用计算,验证下列积分之值为零,其中C均为单位圆周 |z|=1.-|||-(1) (int )_(c)^dzdfrac (dz)(cos z);-|||-(2) (int )_(c)dfrac (dz)({z)^2+2z+2};-|||-(3) (int )_(c)dfrac ({e)^2dz}({z)^2+5z+6};-|||-(4) (int )_(c)^zcos (z)^2dz.

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

曲线C为正向圆周|z|=2, (int )_(c)dfrac (cos z)({(z-1))^3}dz=曲线C为正向圆周A.0B.C.D.

3.6 计算 (int )_(c)dfrac (1)({z)^2-z}dz, 其中C为圆周 |z|=2.

曲线C为正向圆周|z-1|=3, (int )_(c)^3dfrac (3)(2)dz=|z-1|=3, (int )_(c)^3dfrac (3)(2)dz=

设 C 为正向圆周 |z|=2，则 int_(C) (z+e^z)/((z+1)^4) dz = ( )A. $\frac{\pi i}{3e}$B. $\fr

积分int dfrac (cos z)({(pi -z))^3}dz=______积分=______

曲线 C 为正向圆周 |z-1|=3，int_(C) (1)/(z^3(z-2)^2) , dz=A. $\frac{3}{8}\pi i$B. $\frac{

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.

设mathbb(C)为正向圆周|z|=1，则int_(mathbb{C)} z , dz = ( ).A. $6\pi i$;B. $4\pi i$;C. $2

计算积分oint_(c)(1)/(z^101)(1-z^(2))dz，C为正向圆周|z|=1/2.计算积分$\oint_{c}\frac{1}{z^{101}(