Math U See Pre Calculus Solutions Book Author:Steve Demme PreCalculus Solutions Book — PREREQUISITE: The student should have completed ALGEBRA 1, GEOMETRY and ALGEBRA 2, or comparable courses. — Trigonometric Ratios — Inverse Trigonometric Ratios — Use a Calculator and Arc Functions — Angles of Elevation and Depression — Angles < 0?, > 360? — Reference Angles — Cofunctions — Negative Angle Relationships — Prove ... more »Trigonometric Identities