Пошаговое объяснение:
cos(a;b)=(x₁*x₂+y₁*y₂)/(|a|*|b|)
|a|=√(4+1+4)=√9=3 , |b|=√(0+16+0)=√16=4
a*b=-2*0+1*(-4)+(-2)*0=4
cos(a;b)=4/(4*3)=1/3
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Пошаговое объяснение:
cos(a;b)=(x₁*x₂+y₁*y₂)/(|a|*|b|)
|a|=√(4+1+4)=√9=3 , |b|=√(0+16+0)=√16=4
a*b=-2*0+1*(-4)+(-2)*0=4
cos(a;b)=4/(4*3)=1/3