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Black Book Advanced Problems in MathematicsMathematicsContinuity and Differentiability

If f(x) = 2 + |x| - |x - 1| - |x + 1| , then f' (- 1 2 ) + f' ( 1 2 ) + f' ( 3 2 ) + f' ( 5 2 ) is equal to :

Options

  1. A1
  2. B-1
  3. C2
  4. D-2

Correct answer

D. -2

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