# Recent content by julian92

1. ### Integration problem

I didn't really take a look at your solution But in order to solve the integral ,, just substitute >>> u = 8 + x^2 it's straight forward ;)
2. ### Find the arc length of f(x) (x^(5/4))/5

just make the integral like this >>> int of (1/4)Sqrt(16+ Sqrt(x)) dx then you can substitute >> u = 16 + sqrt(x) it'll be easy ;)
3. ### A bit tricky integral

Ahaaaa ,, that's entirely awesome :D thanks soooooo much ,, to all of you guys :) now ,, i can go to rest :)
4. ### A bit tricky integral

But i can't factor (x^4)+1 i mean it's (x^4)+1 ,, not (x^4)-1 i don't know how to use partial fractions with that !!
5. ### A bit tricky integral

hey guys ,, i managed to make the integral look like this [2][int{1/(1+(u^4)) du}] would that be any good !!
6. ### A bit tricky integral

at what step exactly?! and how can i do that ?! would you please show me how :) :blushing:
7. ### A bit tricky integral

it tried it ,, it would also give me : (constant) times int{Sqrt(tan w) dw}
8. ### A bit tricky integral

are you sure about the partial fractions? ,, cuz i didn't enjoy any !! i got the Integral of (2(y^2) / (1 + y^4))dy !!
9. ### A bit tricky integral

Umm ,,, i tried what you said ,, i think that will turn the integral back to itself :S except i'll get Integral of Sqrt(tan(x))dx I'm really stuck now :biggrin: Thanks by the way I appreciate it :D and if you get any ideas i'll be glad to try some :)
10. ### A bit tricky integral

I think that won't work ,, bcoz i'll get Integral of (Sqrt(u)/(1+u^2))du then what the next step?!! i also tried integration by parts after the step u mentioned ,, but it just gets more complicated :confused: More Help Is Appreciated :)
11. ### Finding the area of a circle using integration

You can always get the radius from circle equations !! However, all circle equations are integrated by trigonometric substitution and it can also be done by integration by parts but that is a bit tricky!!
12. ### A bit tricky integral

a bit tricky integral!! Homework Statement Integral of (sqrt(cot[x])dx) Homework Equations I just need a hint :) The Attempt at a Solution
13. ### Integrating a circle

I'm really not sure about the difference of the two :S Does each one have a different method of integration? Thanks in advance :)
14. ### Integrating a circle

thanx for the reply :smile: well ,, the thing is that i'm not really good at contour integration ,, i've been searching for a text to study contour integration for ages ,, and still can't find one with good details and examples and still don't know when to use contour integration!! and...
15. ### Integrating a circle

Homework Statement integrating a circle ,, my main question is that, can we integrate it by contour integration technique ? and if yes ,, would you plz show me how :) or just give me a hint :D Thanks is advance :-) Homework Equations y^2 + x^2 = a^2 where a= r suppose that...