Integral of (ln²(x))/x dx

The solution

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  5           
  /           
 |            
 |     2      
 |  log (x)   
 |  ------- dx
 |     x      
 |            
/             
2

$$\int\limits_{2}^{5} \frac{\log{\left(x \right)}^{2}}{x}\, dx$$

Integral(log(x)^2/x, (x, 2, 5))

Detail solution

There are multiple ways to do this integral.
Method #1
1. Let $u = \log{\left(x \right)}$ .
  
  Then let $du = \frac{dx}{x}$ and substitute $du$ :
  
  $\int u^{2}\, du$
  1. The integral of $u^{n}$ is $\frac{u^{n + 1}}{n + 1}$ when $n \neq -1$ :
    
    $\int u^{2}\, du = \frac{u^{3}}{3}$
  Now substitute $u$ back in:
  
  $\frac{\log{\left(x \right)}^{3}}{3}$
Method #2
1. Let $u = \frac{1}{x}$ .
  
  Then let $du = - \frac{dx}{x^{2}}$ and substitute $- du$ :
  
  $\int \left(- \frac{\log{\left(\frac{1}{u} \right)}^{2}}{u}\right)\, du$
  1. The integral of a constant times a function is the constant times the integral of the function:
    
    $\int \frac{\log{\left(\frac{1}{u} \right)}^{2}}{u}\, du = - \int \frac{\log{\left(\frac{1}{u} \right)}^{2}}{u}\, du$
    1. Let $u = \log{\left(\frac{1}{u} \right)}$ .
      
      Then let $du = - \frac{du}{u}$ and substitute $- du$ :
      
      $\int \left(- u^{2}\right)\, du$
      
      The integral of a constant times a function is the constant times the integral of the function:
      
      $\int u^{2}\, du = - \int u^{2}\, du$
      
      The integral of $u^{n}$ is $\frac{u^{n + 1}}{n + 1}$ when $n \neq -1$ :
      
      $\int u^{2}\, du = \frac{u^{3}}{3}$
      
      So, the result is: $- \frac{u^{3}}{3}$
      
      Now substitute $u$ back in:
      
      $- \frac{\log{\left(\frac{1}{u} \right)}^{3}}{3}$
    So, the result is: $\frac{\log{\left(\frac{1}{u} \right)}^{3}}{3}$
  Now substitute $u$ back in:
  
  $\frac{\log{\left(x \right)}^{3}}{3}$
Add the constant of integration:

$\frac{\log{\left(x \right)}^{3}}{3}+ \mathrm{constant}$

The answer is:

$\frac{\log{\left(x \right)}^{3}}{3}+ \mathrm{constant}$

The answer (Indefinite) [src]

  /                        
 |                         
 |    2                3   
 | log (x)          log (x)
 | ------- dx = C + -------
 |    x                3   
 |                         
/

$$\int \frac{\log{\left(x \right)}^{2}}{x}\, dx = C + \frac{\log{\left(x \right)}^{3}}{3}$$

Simplify

The graph

Plot the graph f(x)

The answer [src]

     3         3   
  log (2)   log (5)
- ------- + -------
     3         3

$$- \frac{\log{\left(2 \right)}^{3}}{3} + \frac{\log{\left(5 \right)}^{3}}{3}$$

     3         3   
  log (2)   log (5)
- ------- + -------
     3         3

$$- \frac{\log{\left(2 \right)}^{3}}{3} + \frac{\log{\left(5 \right)}^{3}}{3}$$

-log(2)^3/3 + log(5)^3/3

Numerical answer [src]

1.27862897076557

1.27862897076557

Use the examples entering the upper and lower limits of integration.

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Identical expressions

Similar expressions

Integral of (ln²(x))/x dx

Limits of integration:

The graph:

Piecewise:

The solution

Method #1

Method #2