I need help with the bottom two integrals, top one is an example of how to do'em
http://i.imgur.com/vRAvJ.jpg?1

- anonymous

- jamiebookeater

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- anonymous

The questions are from the partial fractions section to clue you in on how to maybe go about this

- anonymous

The thing is I went further into this, but it got real hectic. The answer I got for the bottom left integral was similar to the answer, but not quite, not sure where I went wrong

- experimentX

I'll give you short answer of tan
|dw:1349542124538:dw|

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## More answers

- experimentX

|dw:1349542218574:dw|

- experimentX

for the other one ... use weistrass subs ... doesn't look nice to me.

- anonymous

|dw:1349542371259:dw|

- experimentX

|dw:1349542384994:dw|

- anonymous

Oh.. wow, see i don't have math vision like that wth. how do you even know. just you've done it so many times??

- experimentX

I've seen it couple of times.

- anonymous

that's the right answer for that one, but i have to use the substitutions given, when should I sub them in?

- anonymous

and what is "weistrass subs"

- experimentX

http://en.wikipedia.org/wiki/Weierstrass_substitution
no matter what ... these substitutions always work ... if you can find nice answers from other method, don't use this.

- experimentX

looks like you have simplified it so nicely ... |dw:1349542787800:dw|

- anonymous

what hapens to the 4?

- anonymous

i tried taking the 4 out so its 15/256 or something then doing the arctan thing

- zepdrix

Buhaha, you took a picture of your notebook XD Nice handwriting at least c:

- experimentX

yeah that would even make it nicer. |dw:1349542995485:dw|

- anonymous

roflmao "nice", yes.

- anonymous

thnx zep, it's easier for you guys to see and understand the problem that way roflmao

- zepdrix

It's bubbly like comic sans, and it's legible XD hehe

- anonymous

is that right ex?

- experimentX

should be similar to it. not sure ... try working on paper ... doing here is like playing around. i never get it right.

- anonymous

1/(15/256) arctan [(u+1/8)/(sqrt (15/256))]

- anonymous

|dw:1349543315889:dw|

- anonymous

a^2 = 15/256 so a is sqrt(15/256) right

- anonymous

i g2g now, but thanks for all your help. if anyone leaves more detailed info that'd be great, i'll be back to check.

- anonymous

and screw weierstrass

- experimentX

I don't like Weierstrass either

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