this is about Cauchy's integral thereon and formula and the derivative of analytic functions

Question 3.4: Calculate the integral 2z-1 dz . Hint: You can try Cauchy's integral theorem here 2 - z and note the poles inside. Draw a graph of the circle and indicate the poles. + 1 Question 3.5: Calculate dz . = =2 22 -1 1 Question 3.6: Calculate dz . 12/-2 2 (2+4)