Are you aware of every subdiscipline in the
category of mathematics? Perhaps not.
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You might discover something very exciting
that you didn't know existed! 

In ancient times, trigonometry (the study of
angles) was one of many subtopics in
Euclidianstyle synthetic geometry.
Developments in science and technology—notably
astronomy, navigation, and surveying  raised the
study of triangles into a realm of its own where it
could be studied and applied with the powerful
analytical tools of algebra.
Note
Although you can find courses and textbooks
called "Trigonometry," the subject is often
included in courses and textbooks called
"PreCalculus."

Trigonometry
The Unit Circle: Sine and Cosine Functions
Periodic Functions
Trigonometric Identities and Equations
Further Applications of Trigonometry

Note:
Some of these tutorials might require a PDF reader. If you do not have an the Adobe
Acrobat Reader installed on your device, you can
download a free copy here. Many also require the Google Play app for
mobile devices.

Trigonometric Functions (1)
Trigonometric
Functions (2)
Radian Measure and Dynamic Trigonometry
Introduction to Trigonometry A series of 53 video tutorials
by Derek Owens.

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