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Black Book Advanced Problems in MathematicsMathematicsContinuity and Differentiability

If f(x) = cases 1+x & 0 x 2 3-x & 2 < x 3 cases , then f(f(x)) is not differentiable at :

Options

  1. Ax = 1
  2. Bx = 2
  3. Cx = 5 2
  4. Dx = 3

Correct answer

A. x = 1

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