Law of Cosines, Finding Angles & Sides, SSS & SAS Triangles - Trigonometry

This trigonometry video tutorial provides a basic introduction into the law of cosines. It explains how to use the law of cosines formula for finding angles and for finding the value of missing sides. It explains how to solve the sss triangle and the sas triangle using the law of cosines first and then finishing up the problem using the law of sines formula. This trig video contains plenty of examples and practice problems.

Solving Trig Equations - Finding All Solutions:

Solving Trig Equations With Multiple Angles:

Solving Trig Equations With Double Angles:

Law of Sines:

More Examples - Law of Sines:

Area of an Oblique Triangle:

______________________________
The Height of a Triangle - Heron's Formula:

Polar Coordinates:

Polar Equations to Rectangular Equations:

Rectangular Equations to Polar Equations:

How To Graph Polar Equations:

_________________________________
Complex Numbers - De Moivre's Theorem:

Dot Product of Two Vectors:

Trigonometry Final Exam Review:

Final Exams and Video Playlists:

Full-Length Videos and Worksheets:

[Bentley]

With classes now online, you are basically my teacher now..

[Yellowbrick]

There are a ton of math tutorial videos on Youtube, but there is something about the way you explain things and the calming presence of your voice that makes it so much easier to understand. I always watch multiple videos on the same subject only to find yours and things finally click. Thanks so much for what you do!

[Nadia-hjtc]

the only youtube channel that actually helps me with math. bless u sir

[ralphcesaryabut]

Not all heroes wear capes. I owe you my entire semester.

[zah]

You is a gift from God, You are a blessing, , and I want to say Thank you very much. You make everything that seemed hard at first easy. Thank you and God bless you.

[mqmswfy]

You know, i listened to my teachers for many years to understand those methods You did better in 10mins
You're the 21s legend brother

[GP-edch]

idk why you teach me more than a 90 minute lecture man. Thank you so much

[Xfilesfreak]

Thank you for keeping things short and to the point. My professor was all over the place when teaching this and skipped around making it really difficult to follow. Now it makes perfect sense to me and you're a life saver!

[sigrid.]

Just got a 94 in my Trigonometry class because of you ❤

[Fawaffles]

The way his teaching and his calm voice make me never stress when studying while watching this dude

[pear]

When your math teacher uses the easiest problems for examples, you don’t learn much..

[lincolnscott]

Thank you so much, Organic Chemistry Tutor! You're so helpful to many and many of us wouldn't understand these lessons without you

[awarnick]

Thank you for doing these. Your explanations are SO clear and concise.

[romantitus]

As usual, I learn more about law of cosines in this video then a teacher that taught this for 2 weeks and I had no idea until I saw this.

[jananiu]

my ninth grade ass skipped classes so i really needed this lmao

[Kasserrr]

Without you I wouldn’t be able to maintain an A in my class I am eternally grateful

[akari]

I take my GED this year, your videos are really helping me out! Thank you so so much! Your explinations are so clear and really helpful! God bless you sir :)

[bellelirazan]

Thank you so much for this, I was very confused when this was first discussed to us, now I fully understand the lesson. Please continue to upload more videos, you saved us all - an online class student

[phyllismurphy]

He is the best. I always go to him first. So patient and kind. I sure would like to see his face.

[georgesadler]

MR. Organic Chemistry Tutor, thank you for another awesome video on The Law of Cosines. This is the backbone of Trigonometry.