... From Stargazers to Starships" tries to be self-contained , even in the mathematics it uses. The sections below are meant to refresh your memory about some basic ideas in algebra and trigonometry. ... M-1) Basic ideas . M-1A) Algebra Proficiency Drill . ... M-5) Deriving Approximate Results . ... M-8) How to tell sines from cosines . M-9) Deriving sines and cosines . ... To explore math further, you may look up "Understanding Mathematics" by Peter Alfeld. ... Timeline Glossary Math index . ...