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y' = 20(x² + 2x)^4(2x - 2)
= 80(2x - 2)(x² + 2x)^4
= (160x - 160)(x² + 2x)^4
y = x²-4
√x
y' = 2x√x - (x²-4)1/2 x^-1/2)
x