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Black Book Advanced Problems in MathematicsMathematicsContinuity and Differentiability

Let f: R R is not identically zero, differentiable function and satisfy the equations f(xy) = f(x)f(y) and f(x+z) = f(x) + f(z) , then f(5) =

Options

  1. A3
  2. B5
  3. C10
  4. D15

Correct answer

B. 5

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