added result declaration for new_exponent!=1&&0 for simplify_exponential_function

src/main/py/read_math_function.py

@@ -87,3 +87,5 @@ def simplify_exponential_function(type, function):
         result = [str(new_coefficient)]
     elif new_exponent == 1:
         result = [f"{new_coefficient}x"]
+    else:
+        result = [f"{new_coefficient}x^{new_exponent}"]