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9 , $\dfrac{\sqrt[]{-3x}}{x^{2}-1}$ 10 , $\sqrt[]{(x+2)(x-3)}$ 11, $\sqrt[]{(2x+1)(x-2)}$ 12 , $\sqrt[]{(x+3)(3-x)}$ 13 , $\sqrt[]{x-2}+$ $\dfrac{1}{\sqrt[]{x-2}}$
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