Super Cool Math Teacher Knows How To Wish Mathematically

This is the coolest math calculation we have ever seen (Don't ask us to explain)! All we understood is that last line (should we call it 'last step'?) that says Merry Christmas!  More people wouldn't be hating math if we have cool math lecturers like him in the picture. 

This Post Belongs To 15 Awesome Teachers Everyone Would Like to Have