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12-84.

Multiple Choice: Which of the following statements must be true about the function defined at right? 

  1. is continuous at .

  1. is differentiable at .

  1. is differentiable at .

  1. I only

  1. II only

  1. I and III only

  1. II and III only

  1. I and II only

Therefore is continuous at .

Therefore is not differentiable at .