added result declaration for new_exponent=0 for simplify_exponential_function

src/main/py/read_math_function.py

@@ -82,4 +82,6 @@ def simplify_exponential_function(type, function):
     coefficient = int(coefficient) if coefficient else 1
     exponent = int(exponent)
     new_coefficient = coefficient * exponent
-    new_exponent = exponent - 1
+    new_exponent = exponent - 1
+    if new_exponent == 0:
+        result = [str(new_coefficient)]