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Show that the straight lines whose direction cosines are given by the equations `a l+b m+c n=0` and `u l^2+z m^2=v n^2+w n^2=0` are parallel or perpendicular as `(a^2)/u+(b^2)/v+(c^2)/w=0ora^2(v+w)+b^2(w+u)+c^2(u+v)=0.`

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