This document provides a course description and policies for a precalculus class taught by Winston Chang at De Toledo High School. The course will cover functions, trigonometry, vectors, limits, derivatives and other topics to build students' mathematical understanding through learning both rules and their reasoning. Students are expected to attend class on time with the required materials, complete homework and be respectful of academic dishonesty policies. The teacher welcomes communication from students and parents to support their learning and well-being.