If f(x) = cos(log_e x), then f(x) f(y) - \frac{1}{2} \left [ f \le | Filo
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Class 11

Math

Calculus

Relations and Functions II

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If , then f(x) f(y) - \frac{1}{2} \left [ f \left ( \frac{x}{y} \right ) + f (xy) \right ] has the values                                              (IIT-JEE, 1983)

  1. -1
  2. 1/2
  3. -2
  4. None of these
Correct Answer: Option(d)
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