# How do you find intervals where the graph of #f(x) = x + 1/x# is concave up and concave down?

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- What is the inverse function of #f(x)=1/(1+x)#. How inverse functions appear in graph?
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- How do you find the inflection points of the graph of the function: #f(x) = (x+2) (x-4)^2#?
- What is the second derivative of #y=x*sqrt(16-x^2)#?
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