The number \(\sqrt{63-36\sqrt3}\) can be expressed as \(x+\sqrt3 y\) for some integers \(x\) and \(y.\) What is the

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The number \(\sqrt{63-36\sqrt3}\) can be expressed as \(x+\sqrt3 y\) for some integers \(x\) and \(y.\) What is the value of \(xy?\)

A. -18
B. -6
C. 6
D. 18
E. 27

Answer: A

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