Answer
$f(x)=2x-2$
Work Step by Step
The function $f(x)$ is the derivative of $\int_1^{x} f(t) dt=x^2-2x+1$ by the fundamental Theorem of calculus.
This implies that
$\int_1^{x} f(t) dt=x^2-2x+1$
$\implies f(x)=2x-2$
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