# Slightly twisted from original problem..!(Integration+functions)

Calculus Level 4

If

$$\int e^{x} (\tfrac{x^{2}+1}{(x+1)^{2}}) dx$$ = $$e^{x} f(x)$$ + c

The range of $$f(x)$$ over its domain is R-{a}, where a is an real number.

Find $$a$$.

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