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    Real Analysis: Differential Equations (Leibnitz Formula)

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    Let I be an open interval and n be a natural number. Suppose that both f:I->R and g:I->R have n derivatives. Prove that fg:I->R has n derivatives, and we have the following formula called Leibnitz's formula:

    (fg)^n(x) = the sum as k=0,1,2,...n of(n choose k)f^k(x)g^(n-k)(x) for all x in I.

    Write the formula out explicitly for n=2 and n=3.

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    https://brainmass.com/math/calculus-and-analysis/real-analysis-differential-equations-leibnitz-formula-9872

    Solution Summary

    Leibnitz's formula is used to prove a relationship between derivatives of two functions. The solution is detailed and well presented.

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