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Precalculus

Includes trigonometry and logarithms.
 
 
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Author/Host of Website Walter Milner/Free Download Manager
Type of Educational Content Software
Visit the website: Argand 1.0
Lesson Plans or Teacher Info
Free
Grade Level High (9-12)
From site:  Displays the real and imaginary parts of complex functions, or conformal transformations. Bulit-in functions include sine cosine tan sinh cosh exp and Log, and these can be combined to produce a wide range of expressions such as tan(z-2*i) - sin(z*z). These expressions can be displayed in terms of their real and imaginary parts, or used to tranform shapes from the z to the w plane.
 
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Author/Host of Website EMTeachline/Free Download Manager
Type of Educational Content Software
Visit the website: EMMentor Light
Lesson Plans or Teacher Info
Free
Grade Level Middle and High (6-12)
From site:  Free interactive problem solving software offers math problems in arithmetic, pre-algebra, algebra, trigonometry and hyperbolic trigonometry, a variety of appropriate techniques to solve problems and a unique system of performance analysis with methodical feedback; allows students to practice at their own pace, review their work and get optimal exercises for building missing math knowledge and skills. 
 
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Author/Host of Website dave/catcode.com
Type of Educational Content Website
Visit the website: FAQ About Trigonometry
Free
Grade Level High (9-12)

From site:  Q: What is trigonometry?
A: Trigonometry is the study of how the sides and angles of a triangle are related to each other.

Q:
WHAT? That’s all?
A: Yes, that’s all. It’s all about triangles, and you can’t get much simpler than that.

Q:
You mean trigonometry isn’t some big, ugly monster that makes students turn green, scream, and die?
A: No. It’s just triangles.

Q:
Oh. But isn’t that boring?
A: We’ll try to make it a little more fun by letting you play around with the triangles interactively.

 
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Author/Host of Website Ted Wilcox
Type of Educational Content Website
Visit the website: Free Math Help: Trigonometry
Free
Grade Level High (9-12)

View textbook style lessons as well as video examples from the Geometry section.  Videos include the laws of sines and cosines and trigonometric functions, identities and ratios.

 
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Author/Host of Website Wolfram Demonstration Project
Type of Educational Content Website
Visit the website: High School Precalculus
Lesson Plans or Teacher Info
Free
Grade Level High (9-12)
These free downloadable demonstrations give students a graphic representation of the mathematical calculations they are learning.  There are 90 demonstrations from composing functions using dynagraphs to roots of multiple numbers, from vector addition in a plane to continuous exponential growth. 
 
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Author/Host of Website Vera Fleischer/GalaxyGoo
Type of Educational Content Website
Visit the website: Sine Curve Visualization Tool
Free
Grade Level High (9-12)

Trigonometry Sine Curve Visualization Tool:  As you drag the ball along the perimeter of the circle, a line is drawn between the point on the circle and the corresponding point on the sine curve. The range is from 0 to 360 degrees on the circle and from 0 to 2 PI on the sine curve. For each point, lines are also drawn to represent the values of the sine function (shown in blue) and the cosine function (shown in red) at that point. By dragging the ball along the circle, you can clearly see that as the value of the sine function increases, the value of the cosine function decreases, and vice versa.

 
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Author/Host of Website Paul Dawkins/lamar.edu
Type of Educational Content Website
Visit the website: Trig Cheat Sheet
Free
Grade Level High (9-12)

This Trig Cheat Sheet is a pdf reference outlining the most important points of trigonometric functions.  It includes diagrams and definitions of trig functions, facts and properties, formulas and identities, a unit circle, inverse trig functions, and laws of sines, cosines and tangents.

 
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Author/Host of Website Doug Simms Online
Type of Educational Content Website
Visit the website: Trigonometry I
Free
Grade Level High (9-12)

From site: This page is devoted to the learning of Trigonometry I (basic trigonometry). It is part of the Secondary 4 (Grade 10) math curriculum where I teach, but this material is required knowledge in secondary school Math no matter where you study.

 
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Author/Host of Website Edward Zobel/Zona Land
Type of Educational Content Website
Visit the website: Trigonometry Realms
Free
Grade Level High (9-12)
This is an introductory trigonometry unit that explores the definitions and graphs of trig functions.
 
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Author/Host of Website NeoK12
Type of Educational Content Website
Visit the website: Trigonometry Videos
Lesson Plans or Teacher Info
Free
Grade Level High (9-12)

NeoK12 Trigonometry Videos have lessons to help math students learn about the relationships between the sides and angles of triangles, and the mathematical equations - trigonometric functions - which describe these relationships.

NeoK12

 
 
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