Parametrize the contours of integration and write the integrals in terms of the parametrizations. Do

Shayla Osborne

Shayla Osborne

Answered question

2022-06-04

Parametrize the contours of integration and write the integrals in terms of the parametrizations. Do not calculate them.
( ¯ z ) z 3 d z
where
Γ
is the arc of the circle of radius
2
centered at the origin with initial point at 1+i and terminal point at 1-i that lies in the right half-plane and is transversed once.

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Answer & Explanation

dalennauf5q69

dalennauf5q69

Beginner2022-06-05Added 2 answers

The circle of radius 2 centered at the origin is parametrized by z = 2 e i θ , 0 θ 2 π. However, we want just the arc Γ of the circle. So the range of θ will be restricted. In polar form, 1 + i = 2 e i π / 4 and 1 i = 2 e i π / 4 . So θ ranges from π / 4 to π / 4. Further, since Γ is traversed from 1 + i to 1 i, it follows that Γ is oriented clockwise. Thus
Γ z ¯ z 3 d z = π / 4 π / 4 2 e i θ 2 3 / 2 e 3 i θ i 2 e i θ d θ = i 2 π / 4 π / 4 e 3 i θ d θ .

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