"Rechner" "Keine Zahl" "Fehler" "," "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "cos" "ln" "log" "sin" "tan" "clr" "del" "Eulersche Zahl" "Pi" "Dezimalzeichen" "Klammer auf" "Klammer zu" "Kosinus" "natürlicher Logarithmus" "Logarithmus" "Sinus" "Tangens" "plus" "dividieren" "Fakultät" "Mal" "Potenz" "Quadratwurzel" "minus" "löschen" "löschen" "ist gleich"