Corrected MPExpression -itemAtIndex:referenceFrame:MPSymbolReferenceFrame

Corrected Deformed Number Format
Added "arcsin", "arccos", "arctan", "lg", "log", "ln" Elementary Functions

MathPad/MPExpressionTokenizer.m

@@ -49,9 +49,9 @@
     NSString *regexStringFormat = @"\\A(?:"
                             @"([\\*∙⋅])|"
                             @"([+-](?:\\s*[+-])*)|"
-                            @"((?:\\d+%@(?!\\d+))|(?:(?:\\d*%@){2,}\\d*)|%@)|" // Substitute with decimal separator 3 times
+                            @"((?:\\d+%@(?!\\d+))|(?:(?:\\d*%@){2,}\\d*)|%@(?!\\d+))|" // Substitute with decimal separator 3 times
                             @"((?:\\d+(?:%@\\d+)?)|(?:%@\\d+))|" // Substitute with decimal separator 2 times
-                            @"(sin|cos|tan|asin|acos|atan)|"
+                            @"(sin|cos|tan|asin|arcsin|acos|arccos|atan|arctan|lg|log|ln)|"
                             @"([A-Za-z])|"
                             @"(!)|"
                             @"(=)|"