limx乘以sin2\x;x(x邹向于0)不懂啊limx乘以sinx分之2 x趋向于无限

limx乘以sin2\x;x(x邹向于0)不懂啊limx乘以sinx分之2 x趋向于无限
limx乘以sin2\x;x(x邹向于0)
不懂啊
limx乘以sinx分之2 x趋向于无限

limx乘以sin2\x;x(x邹向于0)不懂啊limx乘以sinx分之2 x趋向于无限
用无穷小等价代换sinx分之2~2/x
limx乘以sinx分之2=limx*x分之2=2