Given a real number a > 0, consider the triangle Δ with vertices 0, a, a + ia. If Δ is given the counter clockwise orientation, then the contour integral \(\rm \oint_{\Delta} {Re}(z) d z\) (with Re (z) denoting the real part of z) is equal to
1
0
2
\(i \frac{a^{2}}{2}\)
3
ia2
4
\(i \frac{3 a^{2}}{2}\)
5
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