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Black Book Advanced Problems in MathematicsMathematicsContinuity and Differentiability

If f(x) = (x^4, x^2, 1 81 ) x [0, ) , then the sum of the square of reciprocal of all the values of x where f(x) is non-differentiable, is equal to :

Options

  1. A1
  2. B81
  3. C82
  4. D82 81

Correct answer

C. 82

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