i am confused

3. Use Cauchy's integral formula for derivatives to evaluate the following integrals. sin 3z (a) dz. 4(0;1) 24 32 + 1 (b) 2(2 - 2)2 dz, where y is the contour of Question 1(c). cosh z (c) dz, where y is the contour shown below. 2(2+1)2 Hints: For (b): Same idea as in 1(c). For (c): Use a partial fraction decomposition and split the integral into three (with the same y). You may want to consult the partial fractions section of your first-year calcu- lus textbook. For both (b) and (c): Some of the integrals in the process will require the "normal" Cauchy integral formula