Mister Exam

Integral of dr/r dx

Limits of integration:

from to
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The graph:

from to

Piecewise:

The solution

You have entered [src]
  1     
  /     
 |      
 |  1   
 |  - dr
 |  r   
 |      
/       
0       
011rdr\int\limits_{0}^{1} \frac{1}{r}\, dr
Integral(1/r, (r, 0, 1))
Detail solution
  1. The integral of 1r\frac{1}{r} is log(r)\log{\left(r \right)}.

  2. Add the constant of integration:

    log(r)+constant\log{\left(r \right)}+ \mathrm{constant}


The answer is:

log(r)+constant\log{\left(r \right)}+ \mathrm{constant}

The answer (Indefinite) [src]
  /                 
 |                  
 | 1                
 | - dr = C + log(r)
 | r                
 |                  
/                   
1rdr=C+log(r)\int \frac{1}{r}\, dr = C + \log{\left(r \right)}
The graph
0.001.000.100.200.300.400.500.600.700.800.90-1000010000
The answer [src]
oo
\infty
=
=
oo
\infty
oo
Numerical answer [src]
44.0904461339929
44.0904461339929
The graph
Integral of dr/r dx

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