Let a triangle have side lengths , , and with opposite angles , , and . Then
(1)
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(2)
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(3)
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Let a triangle have side lengths , , and with opposite angles , , and . Then
(1)
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(2)
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(3)
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Weisstein, Eric W. "Newton's Formulas." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NewtonsFormulas.html