This month the North Carolina School of Science and Mathematics released a new edition of Contemporary Precalculus Through Applications, the popular book and the only text in the school’s precalculus courses. But this new edition is available digitally, for free, to not just students at the elite residential high school but high school and college students all over the state. The move is part of a partnership between NCSSM — the only high school that is part of the UNC System — and the nonprofit UNC Press. Print copies of the book’s last edition, published by textbook giant McGraw-Hill, are now going for $50 on Amazon.