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Trigonometry
Trigonometry is a rich field that is first touched on in the mid-High School years. There are many different concepts and many rules to learn which can sometimes lead to confusion. As trigonometric functions are used extensively in Calculus, it is important to have these concepts and rules clear. Hopefully this material will clarify what you need to successfully use Trigonometry.
This topic has been divided into three levels.
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Elementary Trigonometry
Right-angled triangle trigonometry, specifically:
    Elementary ratios
    Exact values of "standard" angles
    Applications of right-angled triangles
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Intermediate Trigonometry
Trigonometry on angles of any size, radian measure, specifically:
    Radian measure
    Ratios of any angle
    Solving trigonometric equations
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Advanced Trigonometry
Trigonometric functions and identities, specifically:
    Sine and Cosine laws
    Graphs of trigonometric functions
    Trigonometric identities
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