Trigonometry is the fourth course of the WCBC mathematics series. Triangles and the unit circle are presented as models to shape the core trigonometric ratios. The relationships of the various trigonometric functions are examined to prepare students for future courses in calculus and/or physics, including application sections related to physics topics. Identities and equations involving trigonometric functions are explored extensively, as well as applications of the Laws of Sines and Cosines. Prerequisite: MA 102 or Instructor Approval