Posted by **Anonymous ** on Friday, November 30, 2012 at 8:32pm.

Use the substitution x=3tan() to evaluate the indefinite integral 93dx/(x^2sprt(x^2+9))

- Calculus -
**Anonymous **, Friday, November 30, 2012 at 8:36pm
correction: use the substitution x=3tan(theta)

- Calculus -
**Steve**, Saturday, December 1, 2012 at 12:18am
so, try it. where do you get stuck?

- Calculus -
**Anonymous **, Saturday, December 1, 2012 at 12:30am
I'm not sure if this is right but after substituting and simplifying I get to:

integral (93/9tan^2theta*3sectheta)*3sec^2theta dtheta

- Calculus -
**Jason**, Saturday, December 1, 2012 at 1:47am
It took me your trig substitution followed by a u substitution to get 93squrt(x^2+9)/9x+C

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