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## Trigonometry

## Introduction

- Discovering SOH-CAH-TOA, by Jackie Doyle, University of Pittsburgh
- Discovering SOH-CAH-TOA, by Jackie Doyle, University of Pittsburgh
- AmplitudeAll Math Words Encyclopedia Encyclopedic entry on amplitude with an interactive Geogebra application. By David McAdams
- Cosine by Linda Fahlberg-Stojanovska
- Sine/Cosine/Tangent Functions by Tony Riehl
- Basic Trig functions of acute right triangles. by Mark Fowler
- Using Reference Triangles to solve trig problems by Mark Fowler
- Effects on sine curve graph of changing parameters in sine function. by Mark Fowler
- Graphing the Sine function using the 5-key point method. by Mark Fowler
- 'Sine wave transformations': Shifting and enlargements of sine wave by Roger Moss.
- Trigonometric Functions - Graphical Visualization. by Lew W. S.
- Solving Non-Right Triangles - AAS - GGB by Jerel L. Welker
- Solving Non-Right Triangles - ASA - GGB by Jerel L. Welker
- Solving Non-Right Triangles - SSA - Ambiguous Case - GGB by Jerel L. Welker
- Solving Non-Right Triangles - SSS - GGB by Jerel L. Welker
- Modeling Harmonic Motion - GGB by Jerel L. Welker
- Plotting Polar Points - GGB by Jerel L. Welker
- Plotting Polar Points - GGB by Jerel L. Welker
- Vector Projection u onto v - GGB by Jerel L. Welker
- unit-circle definitions (animated) by Dimitris Poimenidis
- The curves y=sinx, y=cosx and y=tanx when x is in [-2π, 2π) (animated) by Dimitris Poimenidis
- The graphs of the functions f(x)=ρsinωx and g(x)=ρcos(ωx+φ) by Dimitris Poimenidis
- Cosine Rule as generalization of Pythagoras Theorem by Yiannis Ioannou
- Graphing tan x from it's definition on unit circle Traces the point to create the graph. By Eric Funke
- Trig Ratios Use to explain how trig functions depend on the angle, not on the sides. By Eric Funke
- Trig Ratios Demonstrate consistency of trig ratios irrespective of triangle size, orientation or position. By Edward Nordin Zuber
- Unit Circle How the co-ordinates of a point on the unit circle are related to the sine and cosine of an angle. By Michael O'Loughlin
- Second Quadrant Angles How their trig ratios are related to the trig ratios of their corresponding first quadrant angles. By Michael O'Loughlin
- Third Quadrant Angles How their trig ratios are related to the trig ratios of their corresponding first quadrant angles. By Michael O'Loughlin
- Fourth Quadrant Angles How their trig ratios are related to the trig ratios of their corresponding first quadrant angles. By Michael O'Loughlin
- Negative Angles How their trig ratios are related to the trig ratios of their corresponding positive angles. By Michael O'Loughlin
- Unit Circle & Sin/Cos Curves Unit Circle Lesson Plan Unit Circle Student Worksheet Linking unit circle to sin/cos curves, with student worksheet and lesson plan. By Stephanie Reilly
- Graphing Trig Functions How do changing the a, b, c, and d parameters affect the graph? Created by Daniel Couture
- Sine and Cosine ActivitySine and Cosine WorksheetManipulating the Graphs of Sine and Cosine by Al Vallano (University of Pittsburgh)
- Matching Sine and Cosine by considering components by David Albiston
- Matching Sine and Cosine by considering graphs by David Albiston
- The ambiguous case of the sine rule by David Albiston
- Law of Sines - SSA Ambiguous Case - http://www.geogebra.org/en/upload/files/english/Daniel_A_Kaufmann/Law_of_Sines_SSA.html
- Sine and Cosine Activity in Radians By Katherine Peterson.

## Review

- Trigonometry Function Review by Mike May
- Unit Circle and Trig Functions Visual Display of Trig Functions on the Unit Circle, by Eric Funke