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Examine the differentiability at x=0,1,2...

Examine the differentiability at x=0,1,2 if:
`f(X)={(4-x, xle0),(5x+4, 0ltxle1),(4x^2-3x, 1ltx lt2),(3x+4, x ge 2):}`

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Not differentiable at x=0,1,2
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