//Multivar, doing problems
Rohit: A wise man once said, if the bounds are expressions which are equal to a constant, then let u equal that expression.
Ben: In The Art of War, Sun Tzu recommends an appropriate change of variables.
//Schwartz walks over
Schwartz: People think that The Art of War is about conflict. But actually, The Art of War is about a change of variables with a w sub as the radius.