takbeers

Q: Please can you tell me if my salah is valid if I forgot to say takbeer after the first tashahud and did not perform sajdah sahw.

Q: With regards to Eid Salaah, in the following situations, how does a person cover up for the missed Takbeeraat:

1. If a person joined after the Takbeeraat were made, but he got the Rak'ah.

2. If he missed the first Rak'ah completely.

3. If he missed the Takbeeraat of the second Rak'ah but he made it for the Rukoo'.

4. If he missed the entire second Rak'ah.