???

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- May 18th 2009, 03:30 AMsimplependulumIs my answer to this integral correct
???

- May 18th 2009, 04:03 AMNonCommAlg
- May 19th 2009, 01:25 AMsimplependulum
Thank you so much Mr NonCommAlg

This result really surprised me ! (Surprised) - May 19th 2009, 12:37 PMKaitosan
- May 19th 2009, 12:57 PMMoo
- May 19th 2009, 01:07 PMKaitosan
Huh?

=

which doesn't make sense.

How does ?

Please clarify. Maybe there's some trig information I'm missing or something. - May 19th 2009, 01:11 PMMoo
Maybe because

(Tongueout)

In fact, it can be known that the derivative of tangent is also

It depends on the way you learnt it ^^' - May 19th 2009, 01:13 PMSpec
Another way to look at it:

- May 19th 2009, 01:30 PMKaitosan
ooh I see. Thanks!

One last question -

How do you integrate ? Trig sub and inverse trig function integration seem not to work. - May 19th 2009, 01:31 PMMoo
- May 19th 2009, 01:34 PMKaitosan
Well. In that case, I feel better! For a moment I felt like crap. :p