i hope, i posted thread to right place.
1) proove the result;
2) Find the answer;
For the first question, i tried substitution. then my integral became like this;
where c_1 and c_2 are paths containing -3i and 3i respectively. After this, applied Cauchy's Integral Therom but got zero.
For the second question, i tried to substitute thetas with and but again got nothing. also since our for z_0 and , can we say answer is by Cauchy's Integral Theorem?
Edit: today, there was office hour and i asked to teacher. then he said "i didnt explained the solution of these yet. normally you can solve it from CPV."
so, srry for the question. if i still cant solve after learning cpv then i'm gonna ask again.