(√x+1/√x)^2 - (√x-1/√x)^2
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(√x+1/√x)^2-(√x-1/√x)^2
={(√x+1/√x)+(√x-1/√x)}{(√x+1/√x)-(√x-1/√x)
=(√x+1/√x+√x-1/√x)(√x+1/√x-√x+1/√x)
=2√x.2/√x
=4
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