To state:The number of points where given graph of function is not differentiable.
The numbers are -1 and 4 where is not differentiable.
Given: The graph of function.
Let be any function and graph of this function is given.
It has to find numbers of points at which is not differentiable.
The function is not differentiable at the following numbers:
Because the tangent is vertical at .
Because there is a corner in graph of .
Hence, the numbers are -1 and 4 where is not differentiable.
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