查帮助啊!输入一个问号?后面跟lim multi,回车.就会打开相应的帮助文件,下面是我在打开的内容,希望对你有帮助：limit((x^2-y^2)/(x^2+y^2), {x=0});
-1
limit((x^2-y^2)/(x^2+y^2), {x=0,y=0});
undefined
limit(x+1/y, {x=0,y=infinity});
0
limit(x*y, {x=0,y=infinity});
undefined
limit((sin(x^2)-sin(y^2))/(x-y), {x=0,y=0});
/ / 2 / 2
|sinx / - siny / |
limit|-----------------, {x = 0, y = 0}|
x - y /
limit(1/(y-x),{x=y});
undefined
limit(1/(y-x),{x=y},right);
-infinity
limit(1/(y-x),{x=y},left);