Scientific Calculator Precision 72 is a scientific calculator for scientists, engineers, teachers, and students. Calculates mathematical formulas of any length and complexity. Calculation history can be stored into text file or printed.
There are ten variables or constants available for storing often used numbers. Common Constants and User Constants lists. Precision of calculations is 72 digits. Trigonometric, hyperbolic and inverse functions. Gamma function.

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-72 and sin(2*1E20*pi)=0+-1E-52. 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.

Scientific Calculator Precision 72 has internal precision 81 digits that allows to perform division (the most difficult operation) with precision 72 digits, standard functions (power, logarithm, trigonometric functions, hyperbolic functions) with precision 70-72 digits, and Gamma Function, Lower Incomplete Gamma Function, Upper Incomplete Gamma Function with precision 60-72 digits .

The license of this software is Free Trial Software, the price is $30.00, you can free download and get a free trial.