Trigonometry
Explore angles and the unit circle; identities and equations; triangles and oscillations. Concepts and connections are available independently of video coverage.
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Law of sines
In a triangle, each side divided by its opposite-angle sine has the same value.
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Angles
An angle measures rotation between rays sharing an endpoint.
Law of cosines
The cosine law relates one side to the other two sides and their included angle.
Trigonometric identities
Trigonometric identities hold throughout their common domains, unlike equations requiring selected solutions.
Trigonometric periodicity
Sine and cosine repeat after a full turn; tangent repeats after a half turn on its domain.
Angle addition formulas
Addition formulas express trigonometric functions of summed angles using individual angles.
Knowledge connections
- Law of cosines · Related · Map context
- Trigonometric periodicity · Related · Map context
- Trigonometric identities · Related · Map context
- Angles · Related · Map context