(x/3+6/x) ² expand it using standard formula
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Goodrich
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(x/3 + 6/x)²
= (x/3)² + (6/x)² + 2 (x/3) (6/x)
= x²/9 + 36/x² + 4
=[x4 + 36 (9) + 4 (9x²)]/9x²
= (x + 324 + 36x² ) / 9x²
= ( xª + 36x² + 324 ) / 9x²
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