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a=1÷(3-√11)=(3+√11)÷(-2),
-2a=3+√11,
4a^2=20+6√11,
a^2=5+(3√11)÷2,
b=1÷a,
b=3-√11,
b^2=20-6√11,
a^2-b^2= -15+(15√11)÷2
-2a=3+√11,
4a^2=20+6√11,
a^2=5+(3√11)÷2,
b=1÷a,
b=3-√11,
b^2=20-6√11,
a^2-b^2= -15+(15√11)÷2
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