A) Increasing on \[\left[ 0,\,\infty \right)\]
B) Decreasing on \[\left[ 0,\,\infty \right)\]
C) Decreasing on \[\left[ 0,\frac{\pi }{e} \right)\]and increasing on \[\left[ \frac{\pi }{e},\infty \right)\]
D) Increasing on \[\left[ 0,\frac{\pi }{e} \right)\] and decreasing on \[\left[ \frac{\pi }{e},\infty \right)\]
Correct Answer: B
Solution :
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