Pretended they solved a chalkboard math problem like Ian Goodwill hunting

Headstrong yet aimless, Will Hunting has a genius-level IQ but chooses to work as a janitor at MIT. When he secretly solves highly difficult graduate-level math problems, his talents are discovered by Professor Gerald Lambeau, who decides to help the misguided youth reach his potential. When Will is arrested for attacking a police officer, Professor Lambeau makes a deal to get leniency for him if he gets court-ordered therapy. Eventually, therapist Dr. Sean Maguire helps Will confront the demons that are holding him back.

Documentary featurette for the 15th Anniversary Edition of Good Will Hunting, including interviews with Matt Damon, Ben Affleck, Robin Williams, Gus Van Sant, Chris Moore, and Kevin Smith.

A mathematician is trying to solve a problem

A man is looking for a solution into a mathematical problem that is written on a small piece of paper.