calc a
posted by
steve
.
derivative of;
((1+x^2)^2)sin(2x)

calc a 
Reiny
use the product rule

calc a 
steve
i got (1+x^2)^2(2cos(2x)+sin(2x)(4x(1+x^2)
is that right?

calc a 
Reiny
yes, correct
you might want to consider factoring it a bit more
(I see 2(1+x^2) as a common factor)

calc a 
steve
thanks you so much. that really helped alot