XFunction

XFunction is an app designed to facilitate the study of one-variable functions.
XFunction allows you to display graph of a function, move on it, zoom in or out areas of interest, see the value of the function at the point touched.
But the strength of Xfunction is in the way and speed with which you can do all that.
Thanks to a simple and intuitive interface, XFunction guides you when inserting the function ensuring the correctness of that as you type. Syntactic errors due to bad typing, typically present in applications of this kind will belong only to the past.
So from now thanks to XFunction draw the graph of a function becomes an easy game.

Managed functions below:

sum
difference
multiplication (implicit)
division

square root
cube root
exponential

natural logarithm
decimal logarithm
absolute value

sine
cosine
tangent
cotangent
arcsine
arccosine
arctangent
arccotangent
hyperbolic sine
hyperbolic cosine

variable x

natural numbers 0-9
decimal point (.)

constant pi
Napier’s number (or Euler’s number)

unit of measure of trigonometric functions: degrees or radians

In addition, there are two keys for navigation inside the expression:
-Delete last entry
-Right exit from a block brackets

In summary Xfunction is intuitive, fast, powerful and reliable.
Tested on major commercial devices with resolution: QVGA, WQVGA400, HVGA, WVGA800, WVGA854, WXGA with Android version 2.2 or higher.