Solution

ID: past-exam-of-the-mathematics-course-of-the-year-2-of-the-natural-sciences-course-of-the-university-of-cambridge/2010/paper-2/1/i/solution

Multiplying by makes the first two terms a total derivative:
The resulting Sturm-Liouville form is
Equivalently, an integrating multiplier must satisfy , which reduces to and gives up to a constant. The coefficient is positive for and vanishes linearly at the left endpoint; the weight is positive throughout. The boundedness condition removes the logarithmic local branch, giving the no-log boundary condition at a linearly vanishing Sturm-Liouville endpoint.

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