Lesson Law of Cosines

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This Lesson (Law of Cosines) was created by by Shin123(626) About Me : View Source, Show
About Shin123: Just a kid who solves math problems for fun :)

The Law of Cosines is very useful when it comes to trig problems. It can be used when the Law of Sines fail (click here to see the Law of Sines lesson). It comes in 3 forms, c%5E2=a%5E2%2Bb%5E2-2ab%28cos%28C%29%29, a%5E2=b%5E2%2Bc%5E2-2bc%28cos%28A%29%29, and b%5E2=a%5E2%2Bc%5E2-2ac%28cos%28B%29%29. The lowercase letters are the sides and the uppercase letters are the angles. Each side is opposite its corresponding angle. An example is shown here. This law will come in use during trigonometry.
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