One of the Leibniz Rules One of several Leibniz Rules in calculus deals with higher-order derivatives of products. Let (fg)(n) denote the nth derivative of the product fg, for n ≥ 1.
a. Prove that (fg)(2) = f″g + 2f′g′ + fg″.
b. Prove that, in general,
,
where
are the binomial coefficients.
c. Compare the result of (b) to the expansion of (a + b)n.
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