added selector for simplify_product_function

src/main/py/read_math_function.py

@@ -16,6 +16,8 @@ def read_math_function():
                 simplified = simplify_constant(type, function)
             elif type == "v":
                 simplified = simplify_easy_math_function(type, function)
+            elif type == "p":
+                simplified = simplify_product_function(type, function)
             elif type == "e":
                 simplified = simplify_exponential_function(type, function)
             if not simplified: