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## Homework Statement

y = 2x / (1+x^2)^2

Find dy/dx

## Homework Equations

Chain rule

## The Attempt at a Solution

I completely forgot how to apply the chain rule.. I mean, I can always apply the quotient rule, but I'm sure this is 1000 times easier if you can apply the chain rule. Do you do something like

u = 1+x^2

du = 2x

so

y = du/u

But I may be getting confused with substitution rule with integration.. it's been a while since I touched calculus.. any suggestions?