 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/ib/paper-3/7a/b/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

With the convention

u = \frac{\partial ψ}{\partial y}, v = - \frac{\partial ψ}{\partial x},

ψ (x, y) = \frac{y}{x ^{2} + y ^{2}},

up to an additive constant. Differentiation recovers both velocity components.

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