Adan D- More on the Law of Sines and Oblique Triangles

Here is a site that explains the Law of Sines and gives an example.
http://math.info/Trigonometry/Law_of_Sines/

The Ambiguous Case (SSA)

This case is for two sides and a nonincluded angle (SSA). Since there are several possibilities this case is called the Ambiguous case. I found a website that makes it a bit clearer than the book does, at least for me!

http://www.regentsprep.org/Regents/math/algtrig/ATT12/lawofsinesAmbiguous.htm

Another way to look at laws of sines and cosines

I saw this site and it was helpful to see another way that laws of sines and cosines were explained. Take a look at this!

http://www.clarku.edu/~djoyce/trig/laws.html

Need Extra Help with the Law of Sines???

Khan Academy is a great website because you can watch lectures and you can rewind and replay parts if you don't quite understand them.

Here you can review the law of sines: http://www.khanacademy.org/v/proof--law-of-sines?p=Trigonometry

go to http://www.khanacademy.org/ and scroll down to find more help and more lessons.

If you think Trig is unimportant think again!!!

I came across this website yesterday and thought some of you might like to read it.

http://www.mathworksheetscenter.com/mathtips/trigonometry.html

Good website for learning and honing skills on verifying identities

http://www.karlscalculus.org/trigid_examples.html

This website will help you through the steps to verify identities. It is a good website to review for the test which is coming up on Tuesday.

Great Website

Class, I found a great site to help with learning the trig identities and using the strategies. This is a very clear site and would be helpful for anyone.

http://www.sosmath.com/trig/Trig5/trig5/trig5.html

Scribe Post 4/18/11

Today John Henry showed us some strategies for proving identities. This is also in the book chapter 3.2.

The first strategy we learned was for proving an identity when you have fractions.

Multiply denominator and numerator by the numerator of the opposite side.
Cos^2+sin^2=1 - Pythagorean Identity.
Second strategy - Splitting Fractions with + or - in numerator.

Also below this post Irfan shared a great website on all the strategies for proving identities. Looking at that website was the most helpful for me. I recommend anyone who is having trouble with these to look at this website. It's very simple and well written. A good way to memorize these strategies and identities is flash cards! We have a final coming up soon so I suggest you do that!

Next Scribe: Elijah

Scribe Post 4/18/11

1. Today John Henry showed us some strategies for proving identities. This is also in the book chapter 3.2.

The first strategy we learned was for proving an identity when you have fractions.

Multiply denominator and numerator by the numerator of the opposite side.
Cos^2+sin^2=1 ---> Pythagorean Identity.
Second strategy - Splitting Fractions with + or - in numerator.

Also below this post Irfan shared a great website on all the strategies for proving identities. Looking at that website was the most helpful for me. I recommend anyone who is having trouble with these to look at this website. It's very simple and well written. A good way to memorize these strategies and identities is flash cards! We have a final coming up soon so I suggest you do that!

Next Scribe: Elijah

Irfan Fazal Website Help for verifying trig identities

http://www.karlscalculus.org/trigid_examples.html

This is a website I found which is great to help you on verifying trig functions if you don't feel comfortable with them yet. They will be on the final, so take some time to understand them.

Scribe Post 4/13/11-Adan D.

Today we learned how to prove and not prove identities. We learned the steps and we did examples. Steps(proving not an identity): 1) Plug a value into each side of the equation 2) Simplify both sides 3) check and see if they equal each other. Steps (proving an identity): 1) start with the more complicated side of the equation 2) use cos/sin to simplify 3) other strategies like factoring, and foiling may help. We also learned that you need to know the identities in order to be able to prove identities. Two examples we did are 2sin=sin(2) and 1+secx sinx tanx= sec^2x.

Next Scribe: Alex

John Henry Scribe Post April 12, 2011

Today in class we went over homework involving Identities. Incase you haven't learned them here is a link to Kelsey's Scribe Post about them.

These are Odd/Even Identities:

sin (–x) = –sin x cos (–x) = cos x tan (–x) = –tan x

csc (–x) = –csc x sec (–x) = sec x cot (–x) = –cot x

These are the Basic Identities:

These are the Pythagorean Identities:

sin² θ + cos² θ = 1

tan² θ + 1 = sec² θ

cot² θ + 1 = csc² θ

Next Scribe: Irfan

Kelsey Scribe Post: April 11, 2011

Today in class we learned more about the basic identities, which consist of:

We did some practice problems/ problems from our homework that showed how to write functions in terms of another, how to use these identities to find other function values and how to simplify identities.

We focused on example problem 3 in the book (Pg 168) and went through the steps to solve. (steps are in book, also)

We also briefly learned about odd and even identities (pg 169) and how to classify a function as odd or even.

Next scribe: John henry? not sure.