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OpenStudy (anonymous):
In triangle ABC, if a = 10, b = 7, and c = 8, the the value of cosC is..
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OpenStudy (eric_d):
Use the law of cosines c^2 = a^2 + b^2 - 2ab cos C
OpenStudy (eric_d):
Solve this: 64=100+49-140cos C
OpenStudy (wolf1728):
See attached C = 52.617° So cosine C = 0.60714
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