إِنَّا contains doubled nūn, so it has ghunnah. Its final madd alif is followed by hamzah at the start of the next word, أَعْطَيْنَاكَ, making madd munfaṣil when linked.
These are two different jobs: nasalize the doubled nūn, then maintain the prescribed madd across the word boundary. Do not blur them into one vaguely elongated sound. Mark both points before reciting.
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Al-Kawthar: ghunnah and separate madd
Applied Tajwīd Diagnostics: Four Short Sūrahs
إِنَّا contains doubled nūn, so it has ghunnah. Its final madd alif is followed by hamzah at the start of the next word, أَعْطَيْنَاكَ, making madd munfaṣil when linked.
These are two different jobs: nasalize the doubled nūn, then maintain the prescribed madd across the word boundary. Do not blur them into one vaguely elongated sound. Mark both points before reciting.