A) \[f(x)\] is increasing in \[(2,\infty )\]
B) \[f(x)\] is decreasing in \[(\infty ,-2)\]
C) \[f(x)\] has minima at \[x=2\]
D) \[f(x)\] has maxima at \[x=2\]
Correct Answer: D
Solution :
f(x) has maximum at x= 2 Note: sgn k denotes signum function of k.
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