Eval$e$ las siguientes integrales:

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{x^2\sqrt[\phantom{2}]{9-x^2}}$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{\sqrt[\phantom{2}]{x^2-3}}{x}dx$

${\displaystyle \underset{0}{\overset{3}{}}}\frac{x^3}{\sqrt[\phantom{2}]{x^2+9}}dx$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{x^2+2x}$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{2x^2+13}{(1-x)(x^2+4)}dx$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x^4}{x^2-1}dx$