Use any method to evaluate the integral.

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x^{3}dx}{x^2-36}$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{x^{3}dx}{x^2-36}=$

$($Use parentheses to clearly denote the argument of each function.$)$