ISRO Mechanical & Aerospace 2018 - Question 56

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Topic: Engineering Mathematics

If f(x) = (1-x)/(1+x) then f(1/x) is equal to

  • A. f(x)
  • B. f(x)
  • C. f(-x)
  • D. +/- f(x)

Explanation: Replacing x with 1/x: f(1/x) = (1 - 1/x)/(1 + 1/x) = (x - 1)/(x + 1) = -((1 - x)/(1 + x)) = -f(x).

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