A) Increasing in \[\left( 0,\frac{\pi }{2} \right)\]
B) Decreasing in \[\left( 0,\frac{\pi }{2} \right)\]
C) Increasing in \[\left( 0,\pi \right)\]
D) Decreasing in \[\left( \frac{\pi }{4},\frac{\pi }{2} \right)\]
Correct Answer: A
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