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.
solve 2cos(3theta) = -sqrt(2) em [0, 2pi)
solve 2cos(3theta) = -sqrt(2) em [0, 2pi)
Natural Language
Math Input
