Find the unit vectors each of which is perpendicular to both `bar(u)` and `bar(v)`, where `bar(u) = 2hat(i) + hat(j) - 2hat(k), bar(v) = hat(i) + 2hat(j) - 2hat(k)`

Answer

`pm((2)/(sqrt(17)) hat(i) + (2)/(sqrt(17)) ht(j) + (3)/(sqrt(17)) hat(k))`