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.
int cos((t*n*pi)/4)* cos((m*pi)/4) dt, t=-4 to 4
int cos((t*n*pi)/4)* cos((m*pi)/4) dt, t=-4 to 4
Natural Language
Math Input
Extended Keyboard