MathBox: Calculator

MathBox simplifies calculation:

- Store your calculation steps in "boxes" and reuse them easily.

- Boxes behave like variables (A, B, C, D, E, ...) that you can reuse in your calculations.

- MathBox includes all classical and scientific function, directly accessible from its keyboard extension.

- Display calculation result as rational fraction.

- Functions available:
* Add, example: "2+3 = 5"
* Subtract and negate, example: "-3-2 = -5"
* Multiply, example: "3*2 = 6"
* Divide, example: "12/3 = 4"
* Use parenthesis to define order of operations, example: "(2+3/2)/(12*3+1)
* Exponentiation, example: "3**2 = 9"
* Modulus of a value, example: "10**3 = 1"
* Factorial, example: "5! = 120"
* Exponentiation, example: "pow(2,3) = 8"
* Square root, example: "sqrt(9) = 3"
* Cubic root, example: "cuberoot(27) = 3"
* Nth root, example: "nthroot(27,3) = 3"
* Constants, example: "pi, e, phi"
* Logarithmic functions, example: "log(), ln(), exp()"
* Trigonometric functions, example: "sin(), cos(), tan(), asin(), acos(), atan(), sinh(), cosh(), tanh(), versin(), vercosin(), coversin(), covercosin()"
* Statistic functions, example: "average(), median(), stddev()"