亲爱的网友：f(x)=1g(x)=x^0bf(x)=x-1g(x)=x^2/x-1x=1rcosA,y=-1rsinA,U=｛1,2,3,4,5｝y=x2-4x5在3≤x≤5

Question

亲爱的网友：f(x)=1 g(x)=x^0 b f(x)=x-1 g(x)=x^2/x-1x=1 rcosA,y=-1 rsinA,
U=｛1,2,3,4,5｝y=x2-4x 5在3≤x≤5

Answer 1

limx*sin(1/x) U=｛1,2,3,4,5｝比较y=x2-4x 5在3≤x≤5比较limx*sin(1/x)