Pre-Calculus in 2018

Precalculus by Abramson, Jay

Precalculus with early trigonometry 3rd edition by Berger, M., Viglino, G.

Trigonometry by Frempong, George N.

Essential Precalculus: A Self-Teaching Guide by Hill, Tim

Calculus Workbook for Dummies with Online Practice by Ryan, Mark

Essential Advanced Precalculus: A Self-Teaching Guide by Hill, Tim

Precalculus by Frempong, George N.

Pre-Calculus Equations & Answers: A Quickstudy Laminated Reference Guide by Expolog LLC, Yablonski, Ken

Pre-Calculus for Dummies by Sterling, Mary Jane

Easy Pre-Calculus Step-by-Step, Second Edition by Wheater, Carolyn