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a² = 9 + 4 - 12 . 1/2
a² = 13 - 6
a² = 7
a = √7
cos C = (√7² + 3² - 2²) / 2 . 3 . √7
cos C = (7 + 9 - 4) / 6√7
cos C = 12/6√7
cos C = 2/√7 =