Tuesday, April 13th

We began class by working on the Sum, Difference, Double, and Half Angle Identities packet, which we received last class.

We reviewed the distance formula; when finding distance between two points, you subtract the distance between the x-coordinates and the distance between the y-coordinates, square them each and add the two values.




Think the theorem of pythagoras!


"Mother of All Identities"
"It's from God..." -Mr. O'Brien.




When looking at the relationship between sin and cos, we wrote sin(a - b) in terms of cos:




This gives us the difference identity for sine. In class, we completely derived both the difference and sum equations. In addition to the identities for sin and cos, we also derived the identities for tangent (use FFOO for these guys!).

*Remember, you can reference these identities by looking in the front cover of your textbook.*

Next, we went over the following homework questions the class had: *19, 29, 37, 47, 53, 71


We then began to go over the following Double Angle Identities:









Homework for Next Class:
* p. 415/3, 9, 11, 13, 19, 21, 23, 25, 49
* Prepare for HW quiz next class. You will be given the sum and difference identities for use on the quiz. Happy studying!

And the next scribe shall be...Julia! :)))