fox is a simple f(x) function plotter.
Supported Operators:
    ^    power
    *    multiplication
    /    division
    +    addition
    -    subtraction

Supported Functions:
    acos    arc cosine
    asin    arc sine
    atan    arc tangent
    cos     cosine
    cosh    hyperbolic cosine
    exp     Euler's number to the power
    fabs    absolute value
    log     natural (base e) logarithm
    log10   common (base 10) logarithm
    sin     sine
    sinh    hyberbolic sine
    tan     tangent
    tanh    hyberbolic tangent
    sqrt    square root