求函数y=2sin(2x+派/6),x属于[-派,0]而单调减区间

问题描述:

求函数y=2sin(2x+派/6),x属于[-派,0]而单调减区间

y= 2sin(2x+π/6)
y' = 4cos(2x+π/6)
if y' 4cos(2x+π/6 - π