AndroPlotter Pro 1.0
the author of this app says:
Application for plotting functions. Can plot graphs of polynomials, trigonometric functions, logarithms, functions, aggregation (minimum, maximum, average), decimal numbers and their combinations. You can draw up to eight graphs on one sheet, so not only analyze a single function, but also compare schedules and find the intersection point. You can save documents and sort them by category.
If you've found a bug, please report it in the comments. The sooner we learn about it, the sooner it will be fixed.