Pre-Cal 40S (Winter 2009): pre-test day!!!

Tuesday, April 7, 2009

pre-test day!!!

Hi everyone!

Today in math class we covered a lot and did some reviewing for our test on Thursday.

We started off with a pre-test! Here are the questions and answers.

Question 1

Simplify: sin(2x+π)

A) sin 2x B) cos 2x C) -sin 2x d) -cos 2x

Answer: C) -sin 2x
(highlight to see)

Here is the logic behind that idea....

sin(2x+π)= sina cosb + cosa sinb
= sin(2x)cos(π) + cos(2x)sin(π)
= sin(2x)(-1) + cos(2x)(0)
= -2 sinx

Question 2

The terminal arm of angle θ in standard position passes through point (m,n), where m>0, n>0. Determine the value of sin(π+θ).

$eq=\frac{-n}{\sqrt{m^2+n^2 }}$

$eq=\frac{-m}{\sqrt{m^2+n^2 }}$

$eq=\frac{n}{\sqrt{m^2+n^2 }}$

$eq=\frac{m}{\sqrt{m^2+n^2 }}$

Answer: A

Question 3

Question 4

Question 5

When we were done the pre-test we had time to do a quick review question.

Now for some final remarks about today's class.

1. thanks to Ingrid for making our awesome mascot!!!
2. check out the websites on the right hand side of the blog, for some extra math help. (www.math40s.com)
3. remember to give Rebecca a million dollars tomorrow!
4. There are some extra review questions on today's slides!
5. TEST ON THURSDAY! STUDY!
6. Don't forget to do your BOB
7. I just wanted to make 7 to finish the rainbow (:

The next scribe is my ANNABANANA!!!!