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Veva Garcia edited untitled.tex
about 8 years ago
Commit id: 929496fd3727a359e949ec1807280d86e0a7d27d
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Notice the function $f(z)=\frac{1}{z-4}$ is holomorphic in $\mathbb{C}$$\setminus\left\{4\right\}$ which contains $D\overline [-2,3]$. Thus, we can apply the Cauchy Integral Formula(Theorem 4.30):
\begin{align*}
\frac{1}{2\pi i}\int_{c[-2,3]}\frac{\frac{1}{z-4}}{z+2}dz\\
=2\pi i
f(-2)\\
\end{align*}