In some ways this was better than a cell phone: If you wanted to play BlockDude instead of doing trig identities, this was much more discrete. The only downside is that the TI calculators can’t ...

Working with trigonometric relationships in degrees Trigonometric functions can have several solutions. Sine, cosine and tangent all have different positive or negative values depending on what ...

Use as an introduction or recap to lessons on trigonometry. Discuss with students that the different trig functions are based on ratios and show this by comparing similar triangles.

Stuart Anderson, a professor emeritus of mathematics at Texas A&M University–Commerce, told Scientific American, “A lot of the basic trig ‘identities’ are nothing more than Pythagoras ...