Are the above-mentioned invocations correct regarding the sufficiency from worries, Allah's pleasure, and the forgiveness of sins?

The first Hadith, concerning the recitation of "Hasbiyallahu la ilaha illa Huwa, 'alaihi tawakkaltu, wa Huwa Rabbul 'Arshil 'Azim" (Allah is sufficient for me. There is no god but He. In Him I have placed my trust, and He is the Lord of the Mighty Throne) seven times, is authentic with the wording, "Allah will suffice him for whatever concerns him in this world and the Hereafter." However, the addition "whether he said it truthfully or falsely" is denounced.

The second remembrance, concerning the recitation of "Raditu billahi Rabban" (I am content with Allah as my Lord) three times in the morning and evening, is authentic. And whoever says it, it is a right upon Allah to make him content.

The third remembrance, concerning the recitation of "Astaghfirullahalladhi la ilaha illa Huwal-Hayyul-Qayyumu wa atubu ilaih" (I seek forgiveness from Allah, Whom there is no god but He, the Ever-Living, the Sustainer, and I repent to Him), is established. It has been reported that whoever says it, his sins will be forgiven, even if he fled from the battlefield. However, its restriction to three times is not established, and a weak narration links it to bedtime.