34. Prove the Leibniz rule for the nth-derivative of the product of two n-times dierentiable functions as

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34. Prove the Leibniz rule for the nth-derivative of the product of two n-times di¤erentiable functions as given in (9.42). Namely, if hðxÞ ¼ f ðxÞgðxÞ, then hðnÞðxÞ ¼

Xn k¼0 n

k f ðkÞðxÞgðnkÞðxÞ;

where f ð0ÞðxÞ1 f ðxÞ, and similarly gð0ÞðxÞ1gðxÞ. (Hint: Use mathematical induction.)

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