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  1. O

    What is 5^n=80n

    thanx for ur replies
  2. O

    What is 5^n=80n

    I've got a problem with this: 5^n=80n find n! I can't solve out this one. thanx for ur help, I'm not sure if it's the right place for this thread.
  3. O

    Integral equation

    now I m learning calculus 2, I just want to know, cause I got that questions on my mind. Do you know where I can find web so I can learn about calculus more, especially cal 2. thanx Cronxeh
  4. O

    Integral of sqrt(x^3 -1) dx

    thanx everyone
  5. O

    Integral equation

    thanx for your replies
  6. O

    Integral of sqrt(x^3 -1) dx

    I got this problem from someone by forum too. I thought it wasn't so difficult.. thanx for reply. but is the function really can be integrated?
  7. O

    Integral equation

    I thought the same, it's what I assumed (I heard from my teacher) before but I'm not quite sure. By the way, what does "The series must also converge" mean? and I don't know about Differential Galois Theory. Thanx for your reply :smile:
  8. O

    Integral of sqrt(x^3 -1) dx

    what's that? I don't know about it...
  9. O

    Integral equation

    what does an equation need so that the equation can be integrated? not all of equation can be integarted right? I was quite confuse if it can be integrated or not whether I found a difficult integration. Thanx
  10. O

    Integral of sqrt(x^3 -1) dx

    hm you may be right
  11. O

    Integral of sqrt(x^3 -1) dx

    integral of sqrt(x^3 -1) dx. I have tries it with trigonometri subs, but I only found till integral of 2/3(sin^5/3 (tetha) / cos^2 (tetha) ) d(tetha)
  12. O

    Volume problem

    yesterday I had thought it again and I think I have found it. but it's seems diffrent from yours. why does the integration to y? shouldn't it (4-y)? I assumed that the section is under z=4 and above z+y=4 inside x^2+y^2=4. p=3.14. I will check it again. thanx oh yes I got it now. you subtract...
  13. O

    Formulae derivation

    hm do you mean where does 3 come from? in integration (calculus), we can find the formula by integration. for ball, find antiderivative of p f(x)^2 dx
  14. O

    Volume problem

    problem: find volume bordered by cylinder x^2 + y^2 = 4 and y+z=4 and z=4. the answer is said to be 16p. but I couldn't find it. I found it in double integral part.so it must be solved with double integral. I tried with Jacobian tranformation. nut still couldn't solve it. I was confused...
  15. O

    Integration problem!

    thanx. know i understand. it's only a simple subs. thx anyway.
  16. O

    Integration problem!

    Dextercioby, I don't get what u wrote. in the 4th warning. the (2) would u tell me. thanx
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