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Given a real number $a>0$, consider the triangle $\Delta$ with vertices $0, a, a+i a .$ If $\Delta$ is given the counter clockwise orientation, then the contour integral $\oint_{\Delta} \operatorname{Re}(z) d z$ (with $\operatorname{Re}(z)$ denoting the real part of $z$ ) is equal to

1. 0

2. $i \frac{a^{2}}{2}$

3. $i a^{2}$

4. $i \frac{3 a^{2}}{2}$
in Complex Analysis by Expert | 142 views

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