[Android] Free 'Visual Maths 4D' $0 (Was $2.59) @ Google Play

Visual Math is a graphical calculator and lets you draw graphs of your mathematical functions in 2D, 3D and 4D with a time-variable (t).

• draw graphs with one or two variables like f(x), f(x,y)
• visualize your function in 4 dimensions with a time-variable
• compute value tables
• definite integral and derivative - functions
• matrices, vectors, determinante, inverse, transpose,
• trigonometrical functions like sin, cos, tan, sec
• rounding-functions, floor, ceil, round,
• sum and product-function
• save your functions and make screenshots
• modify your graph-range and set customized color options
• rotate and zoom your graph in three dimensions
• display multiple graphs