Learning goals: Teacher Facing Comprehend cosine and sine as functions whose input is an angle $\theta$ and output is the $x$- or $y$-coordinate of the corresponding point on the unit circle. Draw and label the graphs of $y=\cos(\theta)$ and $y=\sin(\theta)$ for values of $\theta$ from 0 to $2\pi$. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from Alg2.6 Trigonometric Functions, Algebra 2.