 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2025/ib/paper-1/12/12-1g/i/solution

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

Since

csc^{2} z = z^{- 2} + 1/3 + O (z^{2})

, the principal parts cancel and

f_{1} = - 1/3 + O (z^{2})

. The singularity is removable.

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