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Analyze functions (calculator-active)

AP.CALC: FUN‑4 (EU), FUN‑4.A (LO)

Problem

The derivative of a function f is given by f, prime, left parenthesis, x, right parenthesis, equals, natural log, vertical bar, x, vertical bar, dot, x.
On which interval is the graph of f concave up?
Use a graphing calculator.
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