If x2 +
1
18, then the value of x-
Y
will be
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0
Answer:
x2+1/x2=18
subtract 2.x.1/x on both sides
x2+1/x2-2.x.1/x=18-2.x.1/x
(x-1/x)2=18-2
x-1/x=16
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