y=2sin(-2x-π/6)=-2sin(2x+π/6)当π/2 +2kπ＜2x+π/6＜3/2 π+2kπ时，即π/6 +kπ＜x＜2π/3 +kπ时单调递增，所以单调增区间是(π/6 + kπ， 2π/3 + kπ)
