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- Activities in Math: Trigonometry - [ Teens/Mature Teens ] - Three comprehensive modules from Syvum. Each includes theory and explanation, along with practice exercises.
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- Addition Formulas for Sines and Cosines - [ Teens/Mature Teens ] - Describes how the Sine and Cosine Addition Formulas can be derived by using vectors and how these formulas can be remembered relatively easily.
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- Basic Trigonometry - [ Mature Teens ] - Cosine, sine and tangent are defined. The Pythagorean theorem is illustrated as well the number of degrees in a many sided figure.
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- Four Branches of Trigonometry - [ Mature Teens ] - Includes information on the laws of sines and cosines, right triangle trigonometry, and the ambiguous case.
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- GCSE Maths: Trigonometry - [ Teens ] - Explains right triangle properties, historic background, the Pythagorean theorem, and trigonometric functions. Includes definition of terms and illustrations.
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- S.O.S. Math - Trigonometry - [ Mature Teens ] - Covers measuring degrees, equations, and formulas. Includes illustrations and related links.
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- Trigonometry - [ Teens/Mature Teens ] - Introduction to trigonometry. Includes links to trig-based animations and definitions.
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