Pre-Calculus in 2020

Must Know High School Pre-Calculus by Monahan, Christopher

Additional Mathematics by Frempong, George N.

The Mathematics of Virus Spread For Beginners: - An Introductory Work For The General Public by Truesdell, Jerald Duane

Calculus for the Curious by Osband, Kent

Precalculus by Openstax, Deguzman, Sandra, Halsey, Johanna

High School Math Made Understandable Book 3: Math 9, 10, 11, and 12 by Martin, Jeremy

Core Mathematics for WASSCE by Frempong, George N.

College Algebra and Trigonometry by Hornsby, John, Schneider, David, Lial, Margaret

COLLEGE ALGEBRA, Vol. 2: Equations, Systems, Inequalities, Complex numbers, Polynomials, Progressions by Kanoussis, Demetrios P.

Trigonometry: A Combination of Algebra and Geometry by Gerth, Joseph