March 10, 2011

Hi Everyone!

So, today in class we continued with Trigonometric Equations. We learned a new equation for unit circle:

x squared + y squared = 1

cos squared ϴ + sin squared ϴ = 1

But i don't know its purpose because I wasn't listening -___-"

Next!

We learned how to use the terminal points to determine its quadrantal angle.

If r = 1, cosϴ = x and sinϴ = y

For example:

Sinϴ = -1

*look at the value in the ordered pairs. For this one, we're looking at the y's.If it's the same, the angle which it is located is the quadrantal angle.

ϴ = 270

Handouts: Solving Trigonometric Equations 2

Keith R.