Ok ty (can u checked this one)

  • Thread starter ArmiAldi
  • Start date
In summary, we are solving the integral of (dx)/(x lnx^4) by using the substitution u= lnx and the derivative du/dx= 1/x. After substituting for du and dx, we can simplify the integral to (1/4) ln(u) and finally get the solution (1/4) ln(lnx) + C.
  • #1
ArmiAldi
3
0
let me know is this correct or no?
dx)/(x lnx^4)
(dx)/(x 4lnx)
(dx)/(4x lnx)
u = lnx
du/dx = 1/x
(du)(x) = dx

lnx = u dx = (du)(x)

(du)(x)/(4x u)
du/4u
(1/4)ln(u)


(1/4)ln(lnx)
 
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  • #2
I am moving this question to the homework forums. Please post all homework/coursework questions there in future!
 
  • #3
ArmiAldi said:
let me know is this correct or no?
dx)/(x lnx^4)
You mean the integral of this don't you?

(dx)/(x 4lnx)
(dx)/(4x lnx)
u = lnx
du/dx = 1/x
(du)(x) = dx

lnx = u dx = (du)(x)

(du)(x)/(4x u)
du/4u
(1/4)ln(u)


(1/4)ln(lnx)
Well, (1/4) ln(ln(x))+ C. And you didn't really need to write "(du)(x)/(4x u)". From du/dx= 1/x, du= dx/x and you can go ahead and substitute du for the dx/x you already have in the integral.
 

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