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The triangle shown below has side length...

The triangle shown below has side lengths 37, 38 and 39 inches. Which of the following expression gives the measure of the largest angle of the triangle?
(Note : For every triangle with sides of length a, b and c that are opposite `/_A, /_B, and /_C`, respectively. `c^(2) = a^(2) + b^(2) - 2ab cos C`.)

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