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A-Z Calculator HD free is easy-to-use calculator on your iPad. This new product combines powerful calculation algorithm with user-friendly interfaces. You can easily touch the keys in the same order as the actual equation and copy equations and calculation results between 2 displays. FEATURES:24 digits X 3 lines X 2 displaysTouch display to select from 2 displaysTouch the keys in the same order as the actual equation[EXE] key to calculate your equationTouch and move between 2 displays to copy equations and calculation resultsPowerful syntax analysis and display error locationAlmost unlimited equation length15 digits calculation results (Double precision)Last answer memory ([Ans] key)26 memories you can assign the value ([A]-[Z] keys)Multiple equations with [:] and chain calculationMulti-Line playback (16 equations for each displays)Automatically insert [x] based on formula analysis[AC] key to erase selected display[Bs] key to erase 1 left characterAfter calculation, [Up] or [Down] key to call and select from 16 playback equationsAfter calculation, [Left] or [Right] key to call previous playback equation and select cursor location