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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Unit circle
The unit circle relates an angle to cosine and sine coordinates.
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Radians
Radian measure is arc length divided by radius.
Sine and cosine
Sine and cosine are the vertical and horizontal coordinates on the unit circle.
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.
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- Radians · Related · Map context
- Sine and cosine · Related · Map context
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