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.
simplify(not(D)&C)or(not(D&A&B))or(not(D&B&C))
simplify(not(D)&C)or(not(D&A&B))or(not(D&B&C))
Natural Language
Math Input
Extended Keyboard
