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Question
Factorise the following:
`x^2 + (1)/x^2 - 2`
Sum
Solution
`x^2 + (1)/x^2 - 2`
= `x^2 + (1)/x^2 - 2 x xx x(1)/x`
= `(x - 1/x)^2`
= `(x - 1/x)(x - 1/x)`.
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Method of Factorisation : Difference of Two Squares
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