An calculator for performing evaluation of
mathematical expressions that could include not only
basic operations but also elementary and statistical
functions and brackets.
Edit box 'Expression' has to contain a string of
mathematical expression that is supposed to be
calculated.
It can contain:
numbers in with or without decimal point and with or
without a power of 10 like 1.2e-2 or 3.E3;
pi in this application is equal to 3.141592653;
basic mathematical operations +,-,*,/;
power of grade operation ^ used like 2^3 = 8;
brackets determining order of operation execution;
elementary mathematical functions: sin,cos,tan, asin,
acos, atan, ln ,log10, exp ,pow10, abs, sqrt; basic
statistical functions as sum, mean, sigma (standard
deviation) student and trust for calculation
probability and trust interval. Arguments of the
functions have to be an expression surrounded brackets;
Variables can be declared and edited separately from

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