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 \(\oint_{Δ}\)Re(z) dz (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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