Question: Let f(x) = {i -1, if x = 0 , if x #0 (a) Explain whether tangent exists to f at x = 0

Let f(x) = {i -1, if x = 0 , if x 

Let f(x) = {i -1, if x = 0 , if x #0 (a) Explain whether tangent exists to f at x = 0 (b) Is f differentiable for all x?

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