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 cosines
The cosine law relates one side to the other two sides and their included angle.
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Law of sines
In a triangle, each side divided by its opposite-angle sine has the same value.
Sinusoidal models
Amplitude, frequency and phase describe a sinusoidal oscillation.
Angle addition formulas
Addition formulas express trigonometric functions of summed angles using individual angles.
Complex exponentials
Euler's formula links complex exponentials to cosine and sine for real angles.
Inverse trigonometric functions
Restricted domains make trigonometric functions invertible with specified principal-value ranges.
Knowledge connections
- Law of sines · Related · Map context
- Sinusoidal models · Related · Map context