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$\sqrt{1 - 4 x^{2}}$

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Solution

$\begin{matrix} \sqrt{1 - 4 x^{2}} \Rightarrow \sqrt{1^{2} - {(2 x)}^{2}} [a^{2} - b^{2} = (a - b) (a + b)] \sqrt{(1 - 2 x) (1 + 2 x)} \end{matrix}$

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