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Select the angle that correctly completes the law of cosines for this triangle 122 + 132 - 2(12)(13)cos _ = 52 67 13 5 23
Select the angle that correctly completes the law of cosines for this triangle 122 + 132 - 2(12)(13)cos _ = 52 67 13 5 23 90 12 A. 23' B. 180' O C. 67 O D. 90
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