Question: Let f: [a, b] x [c, d] R be continuous and suppose D 2 f is continuous. Define f (y) = ba f (x, y)

Let f: [a, b] x [c, d] → R be continuous and suppose D 2 f is continuous. Define f (y) = ∫ ba f (x, y) dx. Prove Leibnitz' Rule: f1 (y) = ∫ ba D2 f (x, y) dx.

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