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The function given by $y = x − 1$ is differentiable for all real numbers except the points

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± 1

0, 1, − 1

− 1

answer is A.

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Detailed Solution

f (x) = | | x | − 1 |

is non-differentiable
Question Image

When |x| = 0 and when |x| -1 = 0 or x = 0 and

x = ± 1.

hence, is not differentiable at x = -1, 0, 1

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