Review - Definition of Sine, Cosine, Tangent
Given an angle in standard position 𝜃, a circle centered at the origin, and a point of intersection 𝑃…
sin𝜃 is the ratio of the vertical displacement of 𝑃 from the 𝑥-axis to the distance between the origin and 𝑃. sin𝜃=𝑦𝑟=𝑦𝑥2+𝑦2 
cos𝜃 is the ratio of the horizontal displacement of 𝑃 from the 𝑦-axis to the distance between the origin and 𝑃. cos𝜃=𝑥𝑟=𝑥𝑥2+𝑦2 
tan𝜃 is the slope of the terminal ray.
tan𝜃=𝑦𝑥=sin𝜃cos𝜃