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A reader asks how to graph f(-x) and -f(x), and what does it mean?

In this Newsletter:

1. Math tip: What is trigonometry all about?
2. How do you find exact values for the sine of all angles?
3. Puzzle
4. Poll results
5. Teacher resource: Teachnology
6. Friday math movies
7. Final thought – doing things right

Terence Tao is quite remarkable, having joined UCLA as a professor at age 20.

Can you find exact values for the sines of all angles? This guest post from reader James Parent shows how.

Some of the earliest animals to appear used efficient fractal (or modular) shapes.

A reader is going to take a trigonometry class soon and asks what it’s about.

In this Newsletter:

1. Summer math brain drain
2. Resource – Graph plotter using JSXGraph
3. Poll results and new poll
4. Visual design for math teachers
5. Friday math movies
6. Resource – Teachers’ Domain
7. Final thought – ambitions

Here’s a very neat way to illustrate Bach’s Crab Canon – using a Mobius strip.

This is a handy and user-friendly graph plotter which works in all major browsers and operating systems.