The derivative of \( f(x)=\sin ^{-1}(2 x) \) is equal to \( \mathrm...

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The derivative of \( f(x)=\sin ^{-1}(2 x) \) is equal to
\( \mathrm{P} \)
(1) \( \frac{2}{\sqrt{1-4 x^{2}}} \)
(2) \( \frac{-2}{\sqrt{1-4 x^{2}}} \)
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(3) \( \frac{1}{\sqrt{1-4 x^{2}}} \)
(4) \( \frac{-1}{\sqrt{1-4 x^{2}}} \)
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