If x = ✓2 + 1 , Find the value of (x - 1/x)²
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x=√2+1
1/x=√2-1/(√2+1)(√2-1)=√2-1/2-1
=√2-1
x-1/x=√2+1-√2+1=2
(x-1/x)^2=2^2=4
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