The Windows Phone app which has gone free next as myAppfree app of the day is Calculator+. Thi is a great replacement for your existing Windows Phone calculator.
This app allows ordinary and scientific calculations. Calculator+ is the most functional calculator in the Windows phone store!.
– plots of function
– complex numbers
– bin, oct, hex calculation modes
– 26 variables, 26 matrix variables, 26 list variables
– math constants
– mathematical, trigonometrical, hyperbolic, special functions
– History of calculations
– dark and light themes
– equation solver (SLE and polynomical)
– CAS GIAC module (symbolic computations like integration, simplification, differentiation and e.t.c)
– Ability to add own functions
Download it today, it is FREE!!!