Six family members, A, B, C, D, E and F, are working as a team on a family project of renovating a house. Each person has been given a single task. A is B’s son and is in charge of ‘flooring’. B is C’s sister and is in charge of ‘water issues’. C is D’s wife and is in charge of ‘electrical work’. D is in charge of ‘foundation related work’ and his son E is in charge of ‘interior decoration’. F, who is D’s brother, is in charge of ‘roof’. What work is assigned to A’s cousin?
Interior decoration
Roof
Electrical work
Foundation related work
If x =\(\frac{\sqrt{3}+1}{\sqrt{3}-1}\) and y =\(\frac{\sqrt{3}-1}{\sqrt{3}+1}\), then the value of x² + y² is: