Trigonometric Identities
Math is Fun
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An overview of how to compute trigonometric functions
Clark University
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Explains what a tangent is and why it matters. Explains the relationship between a tangent in Geometry and a tangent in Trigonometry.
Dave's Short Trig Course
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Explains what a cosine is and why it matters.
Dave's Short Trig Course
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Explains what a sine is and why it matters.
Dave's Short Trig Course
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A Calculator sufficient for advanced algebra and trigonomic functions.
Math Open Reference
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A list of most common trigonometric identities. Includes values of trig functions of most common angles.
math2.org
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