Find a formula for the n-th derivative of f(x) = \displaystyle {e^x\over 1 - x}. That is find a formula for f^{(n)}(x). Also write out the derivative for n = 1, 2, 3.
A formula that is used here for the n-th derivative of a function that is a product of two other functions, f(x)=u(x).v(x) was proven in ANOTHER POST (CLICK ME). The result is that
This formula is used to write down the n-th derivative of
f(x) = \displaystyle{e^x\over 1 - x}.
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