Trigonometry refresher

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…less you're a math major. If you have a sketchy trig background and need more practice and inspiration, I recommend: Trigonometric Delights by Eli Maor, for inspiration. Trigonometry Refresher by A. Albert Klaf for practice problems Advanced Trigonometry by C.V. Durell and A.Robson for examples of advanced applications Statistics is very important and totally overlooked by most hackers and even math majors (including myself.) If you have the opportunity to take a good stats class in high school or university, do so. I do not have any good recommendations on self study, but it seems like books on things like Biostatistics often lay the basics out more clearly than general stats textbooks.