Concept — Seno. Featured in chapters 28 Linked atoms 13 linked atoms. 28 Circonferenza goniometrica e funzioni sin, cos, tan Arcs differing by pi Complementary arcs Domain, range and sign 2 Graphs of sine and cosine Notable values Opposite arcs Periodicity Reading the solutions off the graph Sine, cosine and tangent of an arbitrary angle Supplementary arcs The fundamental identity Values using associated arcs