# Trigonometry

*Trigonometry*is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. Learn

*trigonometry*for free—right triangles, the unit circle, graphs, identities, and more. Full curriculum of exercises and videos.

**This is the property of khanacademy.org and is available for free on their website.**

## Course Content

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Trigonometry with right triangles

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Trigonometry with general triangles

The law of sines
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The law of cosines
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The unit circle definition of sine, cosine, and tangent

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Long live Tau
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Graphs of trigonometric functions

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#### About Instructor

##### Hamza

24 Courses

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