There are two WileyPLUS platforms for this title, so please note that you should purchase this version if your instructor provided course code starts with an "A". Trigonometry , 4th Edition, combines a clear voice that speaks to students with inquiry-based learning projects to deliver a learning resource that bridges the gap between classroom instruction and independent homework. The book fosters an attachment to mathematics and encourages students to become independent, successful math learners. The author offers varied exercise types and modeling projects to increase understanding and improve retention.