If (x+1/x)=12,then find the value of (x-1/x) .

We have a formula
(a-b)2=(a+b)2-4ab
Put a=x and b= 1/x in this formula we get
(x-1/x)2=(x+1/x)2-4=122-4=144-4=140
x-1/x =√140

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