Math Trigonometry sin cos Trigonometric Hand Trick This is an easy way to remember the values of common values of trigonometric functions in the first quadrant.

Learn about Trigonometry with this clear and comprehensive educational poster. The poster is perfect for being displayed in classrooms, school hallways and at home.

From "Information Graphics" by Sandra Rendgen (via Brain Pickings) -- 'Two Mindsets,' Stanford, magazine article, Data Source: Carol Dweck: 'Mindset: The New Psychology of Success', Design: Nigel Holmes

The main weight of the body is carried by the lumbar vertebral bodies and disks. The lamina, facets and spinous process are major parts of the posterior elements that help guide the movement of the vertebrae and protect the spinal nerves.

The carotid arteries transfer to structures outside and inside the skull. The external carotid carries blood to structures outside the skull, primarily the face. The internal carotid carries blood to structures inside the skull, such as the brain.

Summation Notation also known as Sigma Notation. A simple way of expressing the sum of the values of a sequence. This is seen in PreCalculus, Calculus 1 (AP Calc AB), and Calculus 2 (AP Calc BC).

Angle in unit circle showing trig functions as lengths of line segments (interactive). Dave's Short Trig Course is a wonder site geared toward helping geometry students learn trigonometry.