Posted by **Salman** on Monday, December 14, 2009 at 3:19pm.

For the following integral find an appropriate TRIGONOMETRIC SUBSTITUTION of the form x=f(t) to simplify the integral.

INT (x^2)/(sqrt(7x^2+4))dx dx x=?

- Calculus -
**Reiny**, Monday, December 14, 2009 at 4:53pm
This is the first of several YouTube clips where Khan shows in nice detail how to work trig substitution.

http://www.youtube.com/watch?v=n4EK92CSuBE&feature=youtube_gdata

This is part of

http://www.khanacademy.org/

which is a wonderful collection of hundreds of YouTube clips showing most of the mathematical procedures up to college level Calculus.

Let me know if this was helpful

- Calculus -
**Salman**, Monday, December 14, 2009 at 7:06pm
neither of these videos explain the situation where vaiable x is in the numerator, so i still cant solve it

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