Mathematical Software. Mathematical Research. Mathematical Education. Tvalx Products.
College Scientific Calculator 36 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.
Price is $14.00 .
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-36 and sin(2*1E20*pi)=0+-1E-16. 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. 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.
In the default mixed mode the calculator treats numbers as integers wherever it is possible. For example, 38! have an integer result with 45 digits.
There are 10 variables (or constants) available for storing frequently used numbers.
All calculation results are reflected in History rich-text-box, which can be saved in file or printed.
Quick Start page is available in Help tab. There is an online support page as well. If you have questions, write to support@tvalx.com .
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