Introducing Trig Functions - SOHCAHTOA - Trigonometry in Right-angled Triangles - Tutorial 2/5

This tutorial introduces the three identities, functions or 'formulas' used in trigonometry for right-angled triangles (SOHCAHTOA).
Viewers are taught how to identify which function to use for a particular question though these questions aren't actually solved yet.
No background on what 'sin', 'cos' and 'tan' are is given or intended at this stage.