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(1+√2)(1-√2)-(√2+3)²-6√2= 1²-(√2)²- (2+6√2-9-6√2=1-2-2-6√2+9-6√2=6-12√6
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(1+√2)(1-√2)-(√2+3)²-6√2= 1²-(√2)²- (2+6√2-9-6√2=1-2-2-6√2+9-6√2=6-12√6