ВС² = 2² + 3² - 2 · 2 · 3 · соs60=4+9-12·1/2=13-6=7, ВС=√7
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ВС² = 2² + 3² - 2 · 2 · 3 · соs60=4+9-12·1/2=13-6=7, ВС=√7