added selector for simplify_exponential_function

src/main/py/read_math_function.py

@@ -15,6 +15,8 @@ def read_math_function():
                 simplified = simplify_constant(type, function)
             elif type == "v":
                 simplified = simplify_easy_math_function(type, function)
+            elif type == "e":
+                simplified = simplify_exponential_function(type, function)
             if not simplified:
                 print(
                     "Die eingegebene Funktion war ungültig, entspricht nicht der vorgegebenen Syntax"