$x = 1 - x + x^2 - x^3 + x^4 - x^5 + \dots \infty$ સંબંધનું પાલન કરતી $x$ ની કિંમત શોધો.

  • A
    $2 \cos 36^\circ$
  • B
    $2 \cos 144^\circ$
  • C
    $2 \sin 18^\circ$
  • D
    એક પણ નહીં

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