y=cos(2x+π/3),x∈[-2π,2π]的单调递增区间y=cos(2x+π/3),则周期T=π设2x+π/3=X,则X∈[-11π/3,13π/3]由cosX单调递增区间为[π加减2kπ,2π加减2kπ]可得在X∈[-11π/3,13π/3]区间上的递增区间为X=2x+π/3∈[...