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Find the sum of the vectors vec(a) = hat...

Find the sum of the vectors `vec(a) = hat(i) - 2hat(j) + hat(k), vec(b) = -2hat(i) + 4hat(j) + 5hat(k)` and `vec(c) = hat(i) - 6hat(j) - 7hat(k)`.

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The correct Answer is:
`-4hat(j) - hat(k)`
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Show that the vectors vec(a) = 3hat(i) - 2hat(j) + hat(k), vec(b) = hat(i) - 3hat(j) + 5hat(k) and vec(c) = 2hat(i) + hat(j) - 4hat(k) form a right angled triangle.