Posted by **steve ** on Thursday, February 10, 2011 at 8:16pm.

derivative of;

((1+x^2)^2)sin(2x)

- calc a -
**Reiny**, Thursday, February 10, 2011 at 8:21pm
use the product rule

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**steve **, Thursday, February 10, 2011 at 8:35pm
i got (1+x^2)^2(2cos(2x)+sin(2x)(4x(1+x^2)

is that right?

- calc a -
**Reiny**, Thursday, February 10, 2011 at 8:41pm
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 **, Thursday, February 10, 2011 at 9:10pm
thanks you so much. that really helped alot

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