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y=1+√3
x+y=2-√3+1+√3=3
x-y=2-√3-(1+√3)=2-√3-1-√3=1-2√3
x*y=(2-√3)(1+√3)=2+2√3-√3-3= -1+√3
x²=(2-√3)²=4-4√3+3=7-4√3
y²=(1+√3)²=1+2√3+3=4+2√3