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Differentiate w.r.t. x
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\frac{1}{\left(x-3\right)\left(x-1\right)}+x
Factor x^{2}-4x+3.
\frac{1}{\left(x-3\right)\left(x-1\right)}+\frac{x\left(x-3\right)\left(x-1\right)}{\left(x-3\right)\left(x-1\right)}
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{\left(x-3\right)\left(x-1\right)}{\left(x-3\right)\left(x-1\right)}.
\frac{1+x\left(x-3\right)\left(x-1\right)}{\left(x-3\right)\left(x-1\right)}
Since \frac{1}{\left(x-3\right)\left(x-1\right)} and \frac{x\left(x-3\right)\left(x-1\right)}{\left(x-3\right)\left(x-1\right)} have the same denominator, add them by adding their numerators.
\frac{1+x^{3}-x^{2}-3x^{2}+3x}{\left(x-3\right)\left(x-1\right)}
Do the multiplications in 1+x\left(x-3\right)\left(x-1\right).
\frac{1+x^{3}-4x^{2}+3x}{\left(x-3\right)\left(x-1\right)}
Combine like terms in 1+x^{3}-x^{2}-3x^{2}+3x.
\frac{1+x^{3}-4x^{2}+3x}{x^{2}-4x+3}
Expand \left(x-3\right)\left(x-1\right).