 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2022/ii/paper-1/6c/c/solution

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

For

1/4 < r < 1

r < 1

. The perturbation therefore changes sign or phase while its envelope decays:

\frac{1}{4} < r < 1 gives oscillatory decay .

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