Forgetting to make sajda-e-sahw
Q: I forgot to perform sajdah sahw which was wajib upon me during the first 4 rakats of sunnah namaz. Then I started Fardh namaz and once I finished fardh namaz I realised that I forgot to perform sajdah sahw for sunnat namaz. Is it permissible to perform the missed sajdah sahw of the sunnat namaz after the fardh prayer?