Multivariable Cerberus
A would-be math major faces a three-headed guard dog whose heads are x, y and z, standing for multivariable calculus.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-07-17-multivariable-cerberus/ (CC BY-NC 4.0)Transcript
A: "I wish to gain entrance to the math major!" B: "Be my guest. You just have to pass our guard-dog class..."
A: "*gasp* Multivariable Cerberus!" B: "Really, it's just a special case of Vector Cerberus."