The Trig Values Table

Somewhere there's a poster with a table: sin, cos, tan for 0°, 30°, 45°, 60°, 90°. Fifteen values. Teachers say "memorize it." Don't. That table isn't a list of facts — it's the output of two triangles, and you can rebuild every entry in under a minute. Memorize the triangles; let the table write itself.