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The first function we will graph is the sine function. Description from opencurriculum.org. I searched for this on bing.com/images

Unit Circle Trigonometry

Unit Circle Trigonometry

Unit Circle Trigonometry

Unit Circle Trigonometry

Unit Circle Trigonometry

unit circle cos 1/2, root2/2, root3/2

Trigonometry Definition Math Reference Sheet (1 page PDF)

thebeautyofmathematics: Trigonometry Reference Circle Created by Reddit user ‘graaahh’ via /r/mathpics (Direct link to post here; picture found in comments)

sine, cosine and tangent. the hubby and I were just talking about this... urgh I HATED this in school! hes so smart he rattles it all off!

10 Secret Trig Functions Your Math Teachers Never Taught You...(because they are from a pre-calculator world) A diagram with a unit circle and more trig functions than you can shake a stick at. (It's well known that you can shake a stick at a maximum of 8 trig functions.) The familiar sine, cosine, and tangent are in blue, red, and, well, tan, respectively. The versine is in green, and the exsecant is in pink. Excosecant and coversine are also in the image.

A useful way to remember sin(30), sin(45), sin(60): think "1, 2, 3"; cos(30), cos(45), cos(60): think "3, 2, 1" | www.mathisfun.com

Fonction trigonométrique — Wikipédia

cheesemonkey wonders: Life on the Unit Circle - Board Game for Trig Functions

This is a great way to remind students that all reference angles (or triangles) should be relative to the x-axis.