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Systematic
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This is a calculator that you write on. Very clever and very easy to use and it’s free!

  • Works on your smartphone (Android- iOS)
  • Works on your tablet (Android- iOS)
  • Use your handwriting to write any arithmetic formula.
  • Write and calculate mathematical expressions in an intuitive and natural way with no keyboard
  • Supported mathematical symbols:
    • +, -, x, ÷, +/-, 1/x, ()
    • %, √, x!, |x|
    • x, xy , x2
    • cos, sin, tan
    • acos, asin, atan
    • ln , log
    • π, ℯ,
  • Scratch-out gestures to easily delete symbols and numbers

Take a closer look here http://www.visionobjects.com/en/webstore/myscript-calculator/description/