_____ implies f is neither increasing nor decreasing function at the point x<sub>1</sub>.

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9 + 4 =
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_____ implies f is neither increasing nor decreasing function at the point x1.

\({f^'}({x_1}) > 0\)

\({f^'}({x_1}) = 0\)

None of these

\({f^'}({x_1}) < 0\)