ENTEЯ is a simple RPN (reverse Polish notation) calculator.
It sports a two line display, a stack with x,y,z and t. 27 variables to store and recall values and a statistic register for the sums of x, y, x2, y2, xy and n.
It supports basic operations, conversions, trigonometric operations and statistic operations like standard deviation, probability, linear regression and mean values.
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