* Sine and Cosine - Horizontal translation (phase shift) Pi/2 units.
* Tangent and Cotangent - Horizontal translation (phase shift) Pi/2 units.
* Transformations of Sine - Using a, b, and c.
* Transformations of Any Function - Type in any function and explore transformations.
* Cosecant and Secant - Explore the reciprocal relationship.
* Tangent and Cotangent - Explore the tangent and cotangent functions.
* Wave Interference - Sum of trig functions.
* Area of a Sector (in degrees) - Nice one found here.
* Degrees to Radians - Exact fractions and approximate fractions.
* Polar Equations [ Line ] [ Circle ] [ 4-leaved Rose ] [ 3-leaved Rose ] [ Lemniscate ] [ Limacon ]
* Wolfram Alpha - Trigonometry examples.
Selected animated gifs: (Email suggestions to: JTRedden@gmail.com )
![](https://lh3.googleusercontent.com/-hW2SFTN6G8A/U5I6kwl5b-I/AAAAAAAAGjs/405qzV1uVR8/w500-h600-no/tree.gif)
catenary (black/thick) vs parabola (red/thin)
![](https://lh3.googleusercontent.com/-jgKbVeqqSPw/VhL1LnohMXI/AAAAAAAA3ms/Apteq0R8IkY/w346-h236/catenaria.gif)