A \( \frac{-x}{\sqrt{4x^2-1}} \)
B \( \frac{-1}{x\sqrt{4x^2-1}} \)
C \( \frac{-2x}{\sqrt{4x^2-1}} \)
D \( \frac{-2}{x\sqrt{4x^2-1}} \)
Correct Answer: Option B
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