added calculation for simplify_exponential_function

src/main/py/read_math_function.py

@@ -80,4 +80,6 @@ def simplify_exponential_function(type, function):
         return "Der Ausdruck muss die Variable 'x' enthalten."
     coefficient, exponent = function.split('x^')
     coefficient = int(coefficient) if coefficient else 1
-    exponent = int(exponent)
+    exponent = int(exponent)
+    new_coefficient = coefficient * exponent
+    new_exponent = exponent - 1