Closely related to geometry, trigonometry is concerned with triangles and the relationships of their sides and angles. Terminology typically associated with the field of trigonometry includes: sine, cosine and tangent. Developed in the third century BC, trigonometry is essential to the study of astronomy and land surveying. The following trigonometry courses and lectures provide a solid overview of this discipline.
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Trigonometry

Basic Trigonometry Part 1
Salman Khan 00:08:44 
Basic Trigonometry Part 2
Salman Khan 00:05:54 
Radians and Degrees
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Using Trig Functions Part 1
Salman Khan 00:10:02 
Using Trig Functions Part 2
Salman Khan 00:08:37 
The Unit Circle Definition of Trigonometric Functions Part 1
Salman Khan 00:09:07 
The Unit Circle Definition of Trigonometric Functions Part 2
Salman Khan 00:10:11 
Graph of the Sine Function
Salman Khan 00:07:44 
Graph of the Trig Function
Salman Khan 00:10:16 
Graphing Trig Functions
Salman Khan 00:09:53 
Trig Graphs
Salman Khan 00:05:12 
Determining the Equation of a Trigonometric Function
Salman Khan 00:09:51 
Trigonometric Identities Part 1
Salman Khan 00:09:10 
Proof: sin(a+b) = (cos a)(sin b) + (sin a)(cos b)
Salman Khan 00:09:48 
Proof: cos(a+b) = (cos a)(cos b)(sin a)(sin b)
Salman Khan 00:09:22 
Trigonometric Identities Part 2
Salman Khan 00:09:56 
Trigonometric Identities Part 3
Salman Khan 00:08:35 
Trigonometry Word Problems Part 1
Salman Khan 00:09:56 
Trigonometry Word Problems Part 2
Salman Khan 00:02:51 
Law of Cosines
Salman Khan 00:09:26 
Navigation Word Problem
Salman Khan 00:08:00 
Proof: Law of Sines
Salman Khan 00:06:32 
Ferris Wheel Trig Problem Part 1
Salman Khan 00:07:20 
Ferris Wheel Trig Problem Part 2
Salman Khan 00:09:07 
Fun Trig Problem
Salman Khan 00:10:01 
Inverse Trig Functions: Arcsin
Salman Khan 00:10:36 
Inverse Trig Functions: Arctan
Salman Khan 00:10:06 
Inverse Trig Functions: Arccos
Salman Khan 00:13:38 
Trigonometry Identity Review/Fun
Salman Khan 00:11:07

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