Parameters
Use a letter (a, b, k…) in a function, e.g. a*sin(b*x), then drag its slider.
Analyze
Best-fit line (regression)
Enter one point per line as x, y.
Calculus
Move
Drag points to move them, or drag the background to pan.
Table of values
Enter y = x^2, a plain expression, or x = 3 for a vertical line. Open Tools to add points, lines, and more. Drag to pan, scroll to zoom.