only one equation? (Score 1)

One equation is not enough to pass even the simplest test. If you really want to make it in life, you should at least tattoo an entire book on your chest - and carry a mirror with you at all times. Preferably, you should tattoo your entire body to make optimal use of "body language". If you have enough room for a magnifying glass, you could tattoo about 1000 pages of text and equations on your body. I suggest "Partial Differential Equations" by W.A. Strauss, 425 p. and "Viscous Fluid Flow" by F.M. White, 614 pages; These books should put you firmly on the road to the meaning of life.