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Show that the points A, B and C with pos...

Show that the points A, B and C with position vectors , `vec(a)=3hat(i)-4hat(j)-4hat(k),vec(b)=2hat(i) -hat(j)+hat(k)` and `vec (c ) hat(i) -3hat(j)-5hat(k)` respectively, from the vertices of a right angled triangle.

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