यदि $x + y = 3 - \cos 4\theta$ और $x - y = 4 \sin 2\theta$ है,तो:

  • A
    $x^4 + y^4 = 9$
  • B
    $\sqrt{x} + \sqrt{y} = 16$
  • C
    $x^3 + y^3 = 2(x^2 + y^2)$
  • D
    $\sqrt{x} + \sqrt{y} = 2$

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