NumBasis - NumBasis is a basis tool converter for integer numbers written in any of the main numeration systems (decimal,binary,octal,hexadecimal).It supports large number formats(5-digits hexa,7-digits dec) and fast calculation.
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I have written this calculator with 2d and 3d plot function as student project
MatrixGuy A small scale Matrix Calculator which computes determinants, inverses, adjoints and transpose of matrices
Javia Calculator Javia Calculator - easy-to-use calculator for mobile phones. It features a user interface designed for the mobile phone's keypad, which allows quick input of mathematical expressions.
Built-in functions include trigonometric and hyperbolic functions, logarithms and exponentiation, permutations, combinations and factorial
Solve2Go Solve2Go - supports solving equations and inequalities by means of conjectures based on visual thinking. Conjectures can be refuted or supported by examples provided by the tool, and should be proved using symbolic manipulations on paper.
Equations: when we want to know for which values of x the two functions are equal