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Differentiate ((x-1)/(x+1))^2...

Differentiate `((x-1)/(x+1))^2`

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`y=((x-1)/(x+1))^2`
`dy/dx=2((x-1)/(x+1)) cdotd/dx((x-1)/(x+1))`
`2 cdot(x-1)/(x+1)cdot(d/dx(x-1)cdot(x+1)-(x-1)cdot d/dx(x+1))/(x+1)^2`
`=2(x-1)/(x+1) cdot ((x+1)-(x-1))/(x+1)^2`=(4(x-1))/(x+1)^3`
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