Desert Island Formulas

In anticipation of ever being stuck on a deserted island, and wanting to have a minimum of math formulas to remember (from which other formulas can be derived), what would they be? Let’s say that you expect to spend a few years on the island before getting rescued, and your job when you get home depends on math, and you don’t want your math knowledge to get rusty. Here are a couple candidates for useful formulas.

Trigonometric Formulas

The following equation can be used to find many trig identities, and also to derive what many mathematicians consider to be the most beautiful formula in math. Read more…Desert_Island_Formulas