解由x属于 (0.2π)故x/2属于 (0.π)故x/2+2π/3属于 (2π/3.5π/3)故当π≤x/2+2π/3≤5π/3时,函数y=根号3cos(2分之x+2π/3)是增函数故当π/3≤x/2≤π时,函数y=根号3cos(2分之x+2π/3)是增函数即当2π/3≤x≤2π时...