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Using Cauchy's integral formula to evaluate integrals

  • Thread starter Woolyabyss
  • Start date
  • #1
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Homework Statement


Use Cauchy’s integral formula to evaluate the integral along γ(t) of (z/(z+9)^2)dz
where γ(t) = 2i + 4e^it , 0 ≤ t ≤ 2π.

Homework Equations


Cauchy's integral formula

The Attempt at a Solution


I was just wondering is the integral not just zero by Cauchy's theorem since (z/(z+9)^2) is holomorphic inside the circle defined by γ(t) ( the singularity at -9 is outside the circle ).
 

Answers and Replies

  • #2
Samy_A
Science Advisor
Homework Helper
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Homework Statement


Use Cauchy’s integral formula to evaluate the integral along γ(t) of (z/(z+9)^2)dz
where γ(t) = 2i + 4e^it , 0 ≤ t ≤ 2π.

Homework Equations


Cauchy's integral formula

The Attempt at a Solution


I was just wondering is the integral not just zero by Cauchy's theorem since (z/(z+9)^2) is holomorphic inside the circle defined by γ(t) ( the singularity at -9 is outside the circle ).
Yes, that seems to be the case.
 

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