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Find the value of : ( x^(1/2 ) + x^(...

Find the value of :

`( x^(1/2 ) + x^(-1/2 ) ) times ( x^(1/4 ) + x^(-1/4 ) ) times ( x^(1/8 ) + x^(-1/8 ) ) times ( x^(1/8 ) - x^(-1/8 ) )`

( a ) `x + 1/x`
( b ) `( x^2 -1 )/x`

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