Show that f(x)=2/x+1 is indected
"f(x)=\\frac{2}{x+1}"
"y'=-\\frac{2}{(x+1)^2}"
"y''=\\frac{4}{(x+1)^3}"
For "x\\isin (-\\infin,-1)" : "y''<0\\implies f(x)" is concave downward.
For "x\\isin (-1,\\infin)" : "y''>0\\implies f(x)" is concave upward.
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