Ответ:
a^2=3^2+5^2-2*3*5*0.3=9+25-9=25
a=5
a^2 = b^2 + c^2 - b*c*cos = 9 + 25 + 15*0.3 = 25
a = 5
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Ответ:
a^2=3^2+5^2-2*3*5*0.3=9+25-9=25
a=5
a^2 = b^2 + c^2 - b*c*cos = 9 + 25 + 15*0.3 = 25
a = 5