$\mathop {\lim }\limits_{n \to \infty } \cos \left( {\pi \sqrt {{n^2} + n} } \right)$,जहाँ $n \in I$,है

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    अस्तित्व में नहीं है

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