النَّتِيجَةُ صَحِيحَةٌ.
The result is correct.
إِنَّ النَّتِيجَةَ صَحِيحَةٌ.
The result is indeed correct.
وَاللَّهِ إِنَّ النَّتِيجَةَ لَصَحِيحَةٌ.
By God, the result is certainly correct.
The proposition remains substantially the same, while the degree of emphasis changes. Inna strengthens the predication; an oath and the emphatic lām can intensify it further. Greater formal intensity is not automatically greater eloquence.
If the disagreement concerns who produced the result rather than whether it is correct, increasing the emphasis on correctness misses the real issue. Rhetoric must identify the disputed element first.