В треугольнике ABC определи зависимость стороны AB от двух других сторон и угла между этими сторонами. AB2 = AC2 + BC2 - AC BC coszc AB2- AC? + BCP-2AC - BC COSZC + AB2 = AC2% BC2 - 2 AC BC cos2B AB2- AC2+ BCP-2AC BC COS ZA AB2 = AC2 + BC2-2AC BC - cos2B​
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