Representations of the magnitude of all six trig functions are shown on a unit circle. The assertions are proven using the properties of Similar triangles. Additionally, the Pythagorean Identities are shown to be represented by triangles on this diagram.

Series introduction including complete video list:
TR-00: [   • TR-00: Introduction to Trigonometry S...  ]

International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11