$x \in [0, 2\pi]$ के लिए $|\sqrt{2 \sin^4 x + 18 \cos^2 x} - \sqrt{2 \cos^4 x + 18 \sin^2 x}| = 1$ को संतुष्ट करने वाले $x$ की संख्या है

  • A
    $2$
  • B
    $6$
  • C
    $4$
  • D
    $8$

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