added simplify_product_function

src/main/py/read_math_function.py

@@ -88,4 +88,8 @@ def simplify_exponential_function(type, function):
     elif new_exponent == 1:
         return [f"{new_coefficient}x"]
     else:
-        return [f"{new_coefficient}x^{new_exponent}"]
+        return [f"{new_coefficient}x^{new_exponent}"]
+
+def simplify_product_function(type, function):
+    if type != "p":
+        return False