Evaluate $\displaystyle \int ^{2}_{-2}\frac{dx}{4+x^2}$ directly as well as by the sustitution

$\displaystyle x= \frac {1}{t}$ .Examine as to why the two answers do not tally?

THANK YOU!

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- Nov 5th 2008, 07:55 AMADARSHReason for different answers?
Evaluate $\displaystyle \int ^{2}_{-2}\frac{dx}{4+x^2}$ directly as well as by the sustitution

$\displaystyle x= \frac {1}{t}$ .Examine as to why the two answers do not tally?

THANK YOU! - Nov 5th 2008, 10:40 AMMoo