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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Sine and cosine
Sine and cosine are the vertical and horizontal coordinates on the unit circle.
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Inverse trigonometric functions
Restricted domains make trigonometric functions invertible with specified principal-value ranges.
Tangent function
Tangent is sine divided by cosine where cosine is nonzero.
Unit circle
The unit circle relates an angle to cosine and sine coordinates.
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.
Knowledge connections
- Unit circle · Related · Map context
- Tangent function · Related · Map context
- Unit circle · Prerequisite · Map context
- Inverse trigonometric functions · Next concept · Map context