lim 2x/[√(x²+x)+√(x²-x)] =lim 2x/[√x²+√x²]
lim 2x/[√x²+√x+√x²-√x]
=lim 2x/[√x²+√x²+√x-√x]
=lim 2x/[√x²+√x²]
lim 2x/[√(x²+x)+√(x²-x)] =lim 2x/[√x²+√x²
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