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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Inverse trigonometric functions
Restricted domains make trigonometric functions invertible with specified principal-value ranges.
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Angle addition formulas
Addition formulas express trigonometric functions of summed angles using individual angles.
Sine and cosine
Sine and cosine are the vertical and horizontal coordinates on the unit circle.
Trigonometric equations
Solutions must respect periodicity, domains and any restricted angle interval.
Complex exponentials
Euler's formula links complex exponentials to cosine and sine for real angles.
Law of cosines
The cosine law relates one side to the other two sides and their included angle.
Knowledge connections
- Angle addition formulas · Related · Map context
- Trigonometric equations · Related · Map context
- Sine and cosine · Prerequisite · Map context