Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
数列 、(弧度)。收敛到哪个值?(在纸上计算前 4 项。)
数列 、(弧度)。收敛到哪个值?(在纸上计算前 4 项。)
Natural Language
Math Input
Extended Keyboard