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1/5,R={(1,1),(2,2),(3,3)},0,(2tan^(-1)x)...

`1/5,R={(1,1),(2,2),(3,3)},0,(2tan^(-1)x)/(1+x^(2))," Parallel ",(vec(b)_(1)xxvec(b)_(2)).(vec(a)_(2)-vec(a)_(1))=0,4,(pi)/(4)`
The value of the det. `|{:(x+y,y+z,z+x),(z,x,y),(1,1,1):}|` is . . . .. .

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