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.
plot -4+sum(8/(2*m-1)^2/pi^2*cos((2*m-1)*pi*x/2), m=0..5) (x from -5 to 5)
plot -4+sum(8/(2*m-1)^2/pi^2*cos((2*m-1)*pi*x/2), m=0..5) (x from -5 to 5)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random