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# Answer on Calculus Question for pure

Question #3789
Evaluate the improper integral
+&infin;
ʃ dx / x^3 &ndash; 4x
- &infin;
This integral does not converge. At 0- the fuction is -&infin;, at 0+ the fuction is +&infin;.
$PV \int_{-\infty}^{+ \infty}\frac{dx}{x^3 -4x} = 0$

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