How can y=(x-1)^2+2(x-1)(x+2)+(x+2)^2 be differentiated in two different ways?

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We have to find the derivative of y=(x-1)^2+2(x-1)(x+2)+(x+2)^2

Using the product rule and the chain rule:

y' = 2(x - 1)*1 + 2[(x - 1)*1 + (x...

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