જો $2y \cos \theta = x \sin \theta$ અને $2x \sec \theta - y \csc \theta = 3$ હોય,તો $x^2 + 4y^2 = $

  • A
    $4$
  • B
    $-4$
  • C
    $\pm 4$
  • D
    આમાંથી કોઈ નહીં

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