As I mentioned in my last blog, I will be offering three main lines of software on my website, mathteachersresource.com. Available now is the first program, *Basic Trig Functions*, version 3.6. As the title indicates, the main emphasis is on teaching trigonometry at the high school and college level. However, teachers of high school algebra, college algebra and pre-calculus will also find many features of the program to be very useful.

*Basic Trig Functions* has two modes of operation. The first is circle and trig mode. Use it to:

- explore standard trigonometric angles, radian measure, arc length, sine, cosine, and tangent functions.
- create a variety of trig-circle diagrams, which teachers can use to create handouts and test questions.
- find and graph the powers of a complex number in either standard a + bi or polar format.
- find and graph the roots of a complex number in either standard a + bi or polar format.
- graph a wide variety of X-Y variable relations. When the user moves the mouse near a point of intersection, min/max point, or x-intercept, the X-Y coordinates of these points can be found with a click of the mouse.
- graph polar functions. Users can see how polar points are graphed with the click of a mouse.
- explore the Mandelbrot Set. Users can graph the orbit of a complex number and a mini-graph of the Julia Set of a + bi with the click of a mouse.

The second mode of *Basic Trig Functions* allows teachers to easily demonstrate the geometry of the trig functions and special features of the tangent, cotangent, secant and cosecant functions, and investigate special geometric properties of these functions.

I invite you to visit our website to view screen shots that demonstrate the capabilities of the program. **Users can copy all program output to the clipboard to be used in the creation of their own materials.**

All the best,

George Johnson