please help! any tips or help would be awesome. ive gotten through part of the problem, but get lost.

-clay (Rock)

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- Jan 26th 2009, 08:33 AMclaymation14Integration Help (using trig identities)
please help! any tips or help would be awesome. ive gotten through part of the problem, but get lost.

-clay (Rock) - Jan 26th 2009, 08:49 AMgalactus
You're looking good, except you did not square your 3 in the radical after you made the sub.

Then, it simplifies to:

- Jan 26th 2009, 09:02 AMclaymation14
- Jan 26th 2009, 09:14 AMgalactus
Obviously, the square root of tan^2(t) gives tan(t).

The denominator cancels with the 3sec(t) in the dt - Jan 26th 2009, 09:33 AMKrizalid
Well, you don't actually need any sort of trig. identity, so put and you'll turn your integral into an arctangent.

- Jan 26th 2009, 09:41 AMgalactus
Yes, of course, but perhaps the poster is required to use trig sub. That was my impression anyway.