Evaluate int f(x) is polynomaial functi...

Evaluate `int f(x)` is polynomaial function of then the degree, prove that `int e^x f(x) dx=e^x[f(x) f'(x)+f^x=f^x+......+(-1)^n f^n (x)]` where `f^n(x) dx+(d^nf)/(dx^n)`

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