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If f(x + 1/x ) = x^2 + 1/x^2 , x!= 0 the...

If `f(x + 1/x ) = x^2 + 1/x^2` , `x!= 0` then , f(x) is equal to

( a ) `x^2`
( b ) `2 - x^2`
( c ) `x^2 - 2`
( d ) `x^2 + 2`

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