Mathematical calculator RionaCalc Pro

RionaCalc is a simple but powerful calculator that works with arithmetic expressions. The major features of the program are:

supports more then 20 mathematical and logical operators and more than 70 functions
remembers all last expressions and results
works with complex numbers, common fractions, date, time and stings
works with numbers in non-decimal scales of notation: binary, octal and hexadecimal numbers
solves the quadratic and cubic equations
finds root, minimum, maximum of the function and calculates value of define integral in any interval
has built-in module for the units of measurement conversion
unlimited number of user-defined variables
can draw 2D and 3D graphics
has module for testing and training your calculation skills
multi-language interface.

What is new in this version:

Added ability to minimise to tray
Added user units of measurement editor in Preferences window
Added menu to the tray icon
New function for variables of type "date": day_of_week, n_to_date, date_to_n
Plots can be saved as BMP or GIF images
Changes in operators: ^ - now is a power, ** - also is a power, and @ is a bitwise XOR.