$\"\"$

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The three lengths are $\"\"$ and $\"\"$ and $\"\"$ .

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The angle is $\"\"$ .

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Law of cosines : $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

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Therefore, the answer is $\"\"$ .

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$\"\"$

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The answer is $\"\"$ .