# Reason for different answers?

Printable View

• November 5th 2008, 07:55 AM
ADARSH
Reason for different answers?
Evaluate $\int ^{2}_{-2}\frac{dx}{4+x^2}$ directly as well as by the sustitution
$x= \frac {1}{t}$ .Examine as to why the two answers do not tally?
THANK YOU!
• November 5th 2008, 10:40 AM
Moo
Quote:

Originally Posted by ADARSH
Evaluate $\int ^{2}_{-2}\frac{dx}{4+x^2}$ directly as well as by the sustitution
$x= \frac {1}{t}$ .Examine as to why the two answers do not tally?
THANK YOU!

Because there is a problem at t=0 if you substitute x=1/t