1.let x<0.find the vector n=<x,y,z> that is orthogonal to all three vectors u=<1,1,-2>,v=<-1,2,0> and w=<-1,0,1>.
2.find a unit vector that is orthogonal to both u=<0,-1,-1> and v=<1,0,-1>.
(1) Let t be the fourth coordinate
For n to be orthogonal to the three vectors. Then,
(2) The unit vector can be find by first getting the vector
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