# Evaluate the integral using the indicated trigonometric substitution. (use C for the constant.)...

## Question:

Evaluate the integral using the indicated trigonometric substitution. (use C for the constant.)

{eq}\displaystyle \int \frac{-8 x^3}{\sqrt {x^2 + 9}}\ dx,\ x = 3\tan \theta. {/eq}

## Solving Integrals Using Substitution:

It can be noted here that out of many integration solving methods, one of them is the integration by substitution method. The substitution of the variable is important where the derivative is also required to change the variable of the differentials, with respect to which the integration is to be done