MasterCalc program is intended for calculation of many mathematical tasks with the extended possibilities, for example it is possible to calculate such expressions: (4,1-(1,2 323)/5,5) (8 * (1,42 431,54)), sqrt (1-cos (asin (0,25146)) ^4). It is possible to work with 26 variables: a=10 b=20 c=30; (a b c)/2 a. In the calculator there is a history command which sometimes is very useful, it is possible to view all entered earlier command. At the end of operation there is a possibility to save project which includes all earlier entered command, variables. There is a possibility to open at once some projects simultaneously and to work with them.