Let - (4x + 2) 2x2 if x < -1 f(x) = if – 1< x < 1 2x if x > 1 Find a formula for f'(x). Note: f(x) is differentiable at x = -1, but is NOT differentiable at x = 1. Can you see why that is so? if х<-1 f'(x) = if -1< x < 1 if x > 1

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