Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2001/paper-1/4/a/solution

The fundamental theorem of calculus differentiates the upper endpoint, while differentiation under the integral sign differentiates the parameter:
These formulas hold, for example, when and its displayed parameter partial derivative are continuous on a neighborhood of the integration interval and the parameter value.

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