Algebra and Trig
Select two complex numbers and see the product. The arcs help show how complex multiplication is a dilation and rotation (all 3 arcs have the same angle).
Select two complex numbers and see the sum. The lines help show how complex addition is a sequence of translations.
Focus and Directrix
Select the location of the focus and directrix of a parabola and see how the parabola changes. The circle and its radii show how the focus is equidistant from the directrix on the parabola.
Select a function and apply transformations to it. See the written form and the graphed form change.
This one isn't interactive, but simulates data being collected which follows a normal distribution.
Select an angle and which trig functions to display on the unit circle
Select a first order differential equation, a starting point, and a dx and the approximate solution will be traced out
Select a function, starting x-value, ending x-value, rectangle width, and sum type and it the rectangles will be shown.
Select a function and an x-value and the function and tangent line will be graphed.
Select a function, center x-value, and degree and the function and polynomial will be graphed.