$$\sqrt{ \frac{ \sqrt{ 13.69 } }{ \sqrt{ 13.69 } } - \sqrt{ \frac{ 2.89 }{ 2.89 } } }$$
$0$
$$\sqrt{1-\sqrt{\frac{2.89}{2.89}}}$$
$$\sqrt{1-\sqrt{1}}$$
$$\sqrt{1-1}$$
$$\sqrt{0}$$
$$0$$
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