The rate of change of \( \sqrt{\left(x^{2}+16\right)} \) with respe...

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The rate of change of \( \sqrt{\left(x^{2}+16\right)} \) with respect to
\( \mathrm{P} \) \( \frac{x}{x-1} \) at \( x=3 \) is
(A) 2
(B) \( \frac{11}{5} \)
(C) \( -\frac{12}{5} \)
(D) -3
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