Express 1/1+√2 with rational denominator
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(1/1+√2)*[(1-√2)/(1-√2)]
(1-√2)/[(1+√2)*(1-√2)]
(1-√2) /(1²-(√2)²)
(1-√2)/(1-2)
(1-√2)/(-1)
-(1-√2)/1
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