If f ( x ) = cos [π] x + cos [π x ], where [y] is the greatest integer function of y then…

Mathematics · JEE Advanced · NTA ExamsSets, Relations and Functions

If f (x) = cos [π]x + cos [πx], where [y] is the greatest integer function of y then f (π/2) is equal to
  1. cos 3
  2. 0
  3. cos 4
  4. none of these

Answer

(C) cos 4

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