Evaluate the following integral. \int \frac{\ln x}{x^{3}}dx

CMIIh

CMIIh

Answered question

2021-10-31

Evaluate the following integral.
lnxx3dx

Answer & Explanation

Liyana Mansell

Liyana Mansell

Skilled2021-11-01Added 97 answers

Step 1: Given that
Evaluate the integrals
lnxx3dx
Step 2: Formula Used
Integrating by parts:
fg=fgfg
Step 3: Integration
We have,
f(x)=lnx
f(x)=1x
Also,
g(x)=1x3
g(x)=1x3dx
g(x)=12x2
So applying the formula we have,
lnxx3dx=lnx2x2(12x3)dx
=lnx2x2+12x3dx
=lnx2x2+12(12x2)+C
=lnx2x214x2+C

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