ધારો કે $S = \{x \in R : \cos(x) + \cos(\sqrt{2}x) < 2\}$,તો

  • A
    $S = \emptyset$
  • B
    $S$ એ ખાલી ન હોય તેવો શાંત ગણ છે
  • C
    $S$ એ $R - \{0\}$ નો અનંત ઉચિત ઉપગણ છે
  • D
    $S = R - \{0\}$

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