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2014-08-15T05:35:56+05:30

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A = 18.5    b = 13.5    c = 7

cos A = (b² + c² - a² )/ 2 bc     = 125.965 deg
cos B = (a² + c² - b²) / 2 ac      =  36.2 deg
COS C = (a² + b² - c²) / 2 ab   or  180 - A - B  = 17.834 deg

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