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.
Limit((6(x-pi)cos^2(x))/(pi(pi-2x)tan(x-pi/2)),x->pi/4)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random