A)
Interval Function \[(-\infty ,\,\,-4]\] \[{{x}^{3}}+6{{x}^{2}}+6\]
B)
Interval Function \[\left( \left. -\infty ,\,\,\frac{1}{3} \right] \right.\] \[3{{x}^{2}}-2x+1\]
C)
Interval Function \[[2,\,\,\infty )\] \[2{{x}^{3}}-2{{x}^{2}}-12x+6\]
D)
Interval Function \[(-\infty ,\,\,\infty )\] \[{{x}^{3}}-3{{x}^{2}}+3x+3\]
E) None of these
Correct Answer: B
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