第940题:三角函数的单调性
当 x∈x \inx∈ [−2π,2π][-2\pi,2\pi][−2π,2π] 时,函数 y=y=y= sin(x2+π3)\sin(\dfrac{x}{2}+\dfrac{\pi}{3})sin(2x+3π) 的单调递增区间是( ).
A. [−π2,π2]\Big [ -\dfrac{\pi}{2}, \dfrac{\pi}{2} \Big ][−2π,2π]
B. [−5π3,π2]\Big [ -\dfrac{5\pi}{3}, \dfrac{\pi}{2} \Big ][−35π,2π]
C. [π3,5π3]\Big [ \dfrac{\pi}{3}, \dfrac{5\pi}{3} \Big ][3π,35π]
D. [−5π3,π3]\Big [ -\dfrac{5\pi}{3}, \dfrac{\pi}{3} \Big ][−35π,3π]