College Scientific Calculator 27 for Windows 98, Windows ME, Windows 2000, Windows Server 2003, Windows XP and Vista.
This is a product which can be found most useful by scientists, engineers, professors, and students.
The pi becomes for them a “floating” number with arbitrary precision. It seems strange, because 2*pi corresponds to one rotation and counting rotations is much easier then measuring 1E40 radians.
This calculator follows classical approach when uncertainty of f(x) calculation is estimated by formula max|(derivative(f))|*|x*uncertainty(x)|, where maximum of function derivative is considered on interval [x-uncertainty(x), x uncertainty(x)]. Thus sin(2*pi)=0 -1E-27 and sin(2*1E20*pi)=0 -1E-7. As we see, the result’s accuracy degrades with growth of argument, but such approach allows to preserve all trigonometry facts like sin(even number*pi x)=sin(x). Calculators with multi-precision allows to calculate sin of big argument, like 1E40, with any precision, but cannot calculate sin(1E40*pi) since they don’t have pi.