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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Trigonometric identities
Trigonometric identities hold throughout their common domains, unlike equations requiring selected solutions.
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Angle addition formulas
Addition formulas express trigonometric functions of summed angles using individual angles.
Law of sines
In a triangle, each side divided by its opposite-angle sine has the same value.
Radians
Radian measure is arc length divided by radius.
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.
Knowledge connections
- Angle addition formulas · Related · Map context
- Trigonometric equations · Related · Map context
- Radians · Related · Map context
- Law of sines · Related · Map context