Simplify fully (7+210)(7−210)13\displaystyle \frac{(7 + 2\sqrt{10})(7 - 2\sqrt{10})}{\sqrt{13}}13(7+210)(7−210)
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Hence, write down the exact value of 13(7+210)(7−210)\displaystyle \frac{\sqrt{13}}{(7 + 2\sqrt{10})(7 - 2\sqrt{10})}(7+210)(7−210)13.
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