Ответ:
соsА=в^2+с^2-а^3/2вс
соs=5^2+3^2-7^2/2*5*3=-1/2
соs -1/2=120°
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Ответ:
соsА=в^2+с^2-а^3/2вс
соs=5^2+3^2-7^2/2*5*3=-1/2
соs -1/2=120°