Posted by steve on Thursday, February 10, 2011 at 8:16pm.
use the product rule
i got (1+x^2)^2(2cos(2x)+sin(2x)(4x(1+x^2)
is that right?
yes, correct
you might want to consider factoring it a bit more
(I see 2(1+x^2) as a common factor)
thanks you so much. that really helped alot
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