ગણ $S = \{x \in R : 2 \cos \left(\frac{x^{2}+x}{6}\right) = 4^{x} + 4^{-x}\}$ માં ઘટકોની સંખ્યા $.....$ છે.

  • A
    $1$
  • B
    $3$
  • C
    $0$
  • D
    $\infty$

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