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Numbers & Operations

Calculate:  ${\left(\sqrt{6+\mathrm{<mrow><mn>3</mn><mo></mo><msqrt><mn>3</mn></msqrt></mrow>}}+\sqrt{6-\mathrm{<mrow><mn>3</mn><mo></mo><msqrt><mn>3</mn></msqrt></mrow>}}\right)}^2$

$12$

$6$

$\mathrm{<mrow><mn>6</mn><mo></mo><msqrt><mn>3</mn></msqrt></mrow>}$

$18$

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