$\frac{d}{dx}\sqrt{\sec^2 x + \text{cosec}^2 x} = $

  • A
    $4 \text{cosec } 2x \cdot \cot 2x$
  • B
    $-4 \text{cosec } 2x \cdot \cot 2x$
  • C
    $-4 \text{cosec } x \cdot \cot 2x$
  • D
    इनमें से कोई नहीं

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