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.
x=((-6*(1+√5)*(-1)^n+(3*√5-1)*(1/2*(√5-1))^n+(9+5*√5)*(1/2(-1-√5))^n)*e^(-i*π*n))/(1+√5); n=7 簡約
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random