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.
RootReduce[(1+7^(2/3)/((-1+(3*I)*Sqrt[3])/2)^(1/3)+((7*(-1+(3*I)*Sqrt[3]))/2)^(1/3))/6 - Cos[Pi/7]]
RootReduce[(1+7^(2/3)/((-1+(3*I)*Sqrt[3])/2)^(1/3)+((7*(-1+(3*I)*Sqrt[3]))/2)^(1/3))/6 - Cos[Pi/7]]
Natural Language
Math Input
Extended Keyboard
