MAT334--2020F > Quiz 4

LEC0101 Quiz#4 oneA

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**Xun Zheng**:

Evaluate the given integral using the technique of Example 10 of Section 2.3:

$$\int_{γ} \frac{dz}{z^2}$$

where γ is any curve in {z: Re(z)≥0, z≠0}, joining -i to 1+i.

Here is my answer:

First, we observe that γ is not closed.

Since γ is in {z: Re(z)≥0, z≠0}, then

$$f(z)=\frac{1}{z^2}$$ is analytic on D.

Thus we have

$$\int_{γ} \frac{dz}{z^2} = [-\frac{1}{z}]^{1+i}_{-i} = - \frac{1}{1+i}-\frac{1}{i}$$

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