A) increasing \[[0,\,\pi ]\]
B) increasing in \[\left[ 0,\frac{\pi }{2} \right]\]
C) decreasing in \[[0,\,2\pi ]\]
D) decreasing in \[\left[ -\frac{\pi }{2},\,\frac{3\pi }{2} \right]\]
Correct Answer: B
Solution :
\[\phi '(x)={{\cos }^{3}}x\ge 0\] in \[\left[ 0,\,\frac{\pi }{2} \right]\]You need to login to perform this action.
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