∫ 1 e x ( ln x ) 1 / 3 d x = ?
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One should observe that this is an improper integral, undefined at the lower limit of integration, since ln ( 1 ) = 0 . To do the problem properly, use Jeel's method of substitution, u = ln ( x ) , to find the integral from 1 + h to e , and then let h approach zero from above.
It's h that was supposed to be u = in ( x ). so 1 + h = e. thus e = h.
let ln(x)=t^3 so (1/x)dx=3(t^2)dt put it in eq. and solve it.
thank you very much. @Parth Lohomi for so much honour.
I think Its overrated . It should be a Level 1 Problem. @Calvin Lin
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I think level 2-3 is suitable for this problem. It requires seeing that we can do a suitable U-substitution.
∫ 1 e x 3 ln ( x ) d x = 2 3 ln 3 2 ( x ) + C Indefinite Integral = 2 3 □
ADIOS!!!
Let u = ln x ⇔ d u = x 1 d x and u ( e ) = ln ( e ) = 1 & u ( 1 ) = ln ( 1 ) = 0
So ∫ 1 e x ( ln x ) 1 / 3 d x = ∫ 0 1 u 1 / 3 d u = ∫ 0 1 u − 1 / 3 d u = 2 3 [ u 2 / 3 ] 0 1 = 2 3 = 1 . 5
put Ln(x)=t^3.....change the limits and the solution can be visible easily
😐 so weird.
I don't know. 😵😳😕😑😐😡😠😴 -_-
what gives! we have infinity.
thanks for the solution. 👍
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For this problem I did decided to use a simple u substitution of u = ln x .
So, using u = ln x and the change of interval from 0 and 1 we have:
∫ 0 1 u 3 1 d u ⟹ [ 2 3 u 3 2 ] 0 1 ⟹ 2 3