Math for Engaged Learning: Precalculus Second Edition is intended to cater to the needs of senior high school students following the standards set by DepEd as indicated in the K to 12 curriculum guide. Emphasis is given on mathematical skills and performance tasks or project-based activities. It uses mastery and analytical approach. The discussions vary in style depending on the topic of interest so that the approach may involve backward design, discovery approach, or outcome-based approach. This book covers analytic geometry, series and mathematical induction, trigonometry including circular functions, trigonometric identities, inverse trigonometric functions, and polar coordinate system.