a2+1a2+2-2a-2a⇒a+1a2-2×a×1a+2-2a-2a⇒a+1a2-2+2-2a-2a⇒a+1a2-2a-2a⇒a+1a2-2a+1a⇒a+1aa+1a-2a+1a⇒a+1aa+1a-2ans.
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