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Let f(x)=ln(x^4+27). Then

1. f is increasing on the interval(s)

2. f is decreasing on the interval(s)

3. f has local maximum(a) at x=

4. f has local minimum(a) at x=

5. f is concave up on the interval(s)

6. f is concave down on the interval(s)

7. f has inflection point(s) at

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