**Hardest Calculus Problem**. Didn't see somebody had posted this. Chain rule + product rule allows you to differentiate pretty much anything.

Itâ€™s one of the seven millennium prize problems, with a million dollar reward for its solution. Well, there is no lie in the statement that it is indeed a tough subject. Geometry, as you may know, is the study of spatial figures such as cubes and circles, and it is first generalized.