(2x-1/x) by using second indentity.
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Answer:
4x² + 1/x² – 4
Step-by-step explanation:
By using identity: (a – b)² = a² + b² – 2ab :
(2x - 1/x)² = (2x)² + (1/x)² – 2 (2x)(1/x)
= 4x² + 1/x² – 4
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