Math - Sine, Cosine, and Tangent - Pt1

In this lecture we looked at the relationships that exist between the sine, cosine, and tangent on the unit circle and looked at how they change for different angles.

In the next lecture we’ll be expanding on this even further, so stay tuned for part 2!

Another way to see why tangent becomes undefined at 90 and 270 degrees, is not only because we can’t divide by zero, but also because it becomes parallel to the x-axis (as parallels never meet).