## anonymous 4 years ago Need help with this derivative

1. anonymous

$\int\limits_{0}^{a}5x^2\sqrt{a^2-x^2}dx$

2. anonymous

isn't that integral?

3. anonymous

sorry thats what I meant!

4. anonymous

Are you familiar with trigonometric substitution? That calls for a substitution of the form $x = a\sin(t)$ $dx = a\cos(t)$

5. anonymous

oops... $dx = a\cos(t) dt$