Here's my question: Example: examine the function Y=x(x-1)^3 Y'=3x(x-1)^2+(x-1)^3=(x-1^2(4x-1) Y"=4(x-1)^2+2(x-1)(4x-1) ... How did they get 4(x-1)^2+2(x-1)(4x-1)?
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