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.
UPGRADE TO PRO
APPS
TOUR
Sign in
{cos(2*x)+3/4 = cos(Pi-x)^2,-4Pi<=x,x<=-5Pi/2}
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random