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Black Book Advanced Problems in MathematicsMathematicsContinuity and Differentiability

If f(x) = [x] ( x) then f'(k^+) is equal to ( k I and [ ] denotes greatest integer function):

Options

  1. A(k-1) (-1)^k
  2. Bk
  3. Ck (-1)^ k+1
  4. D(k-1) (-1)^ k+1

Correct answer

B. k

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