Worked example that uses the unit circle definition to evaluate trig functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

A couple of more examples of using Trig functions to solve the sides of a triangle.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

Proof of the trig identity: cos(a+b) = (cos a)(cos b)-(sin a)(sin b)

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

Trigonometry problem involving two ships colliding.

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

Proof of the trig identity sin(a+b) = (cos a)(sin b) + (sin a)(cos b)

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

More playing around with trig identities

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

Worked example evaluating sine and cosine using soh cah toa definition.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

This worked example can be done without trigonometry, but we do show how knowledge of 30-60-90 triangles can be helpful when evaluating trig functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

Extending SOH CAH TOA so that we can define trig functions for a broader class of angles

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

The second part of the problem of the off-track ship captain

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

A few more examples using SOH CAH TOA

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

Walk-through of the Khan Academy Unit Circle Manipulative.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

Technical Reference Publication

Excerpt: The set you suggest was created, I assume, by the systems programmer(s) who wrote TELNET in TENEX. It is a set of historical accidents, and shows it. A better source for standard mnemonics might be the NIC site codes, since these have been chosen with more care and will become familiar as we begin to use the NIC on-line. Surely the NIC is a more reasonable source for a defacto standard than a particular system programmer.

Vol. 12