考研数学题。。求极限 f(Xn)=[2nπ+(π/2)]* sin[2nπ+(π/2)]=[2nπ+(π/2)]* 1 = 2nπ+(π/2)可视为线性函数散点图,,,当n趋于∞,2nπ趋于∞,f(Xn)=+∞。f(Yn)=nπ*sin(nπ)=0