إِيَّاكَ نَعْبُدُ وَإِيَّاكَ نَسْتَعِينُ
You alone we worship, and You alone we ask for help.
The conjunction “wa” joins two related commitments. Repeating “iyyāka” before the second verb independently foregrounds the restriction of seeking help. Simply saying “wa-nastaʿīnu” would not provide the same explicit repetition.
The repetition is not useless padding: each fronted object belongs to a separate verb and reinforces a separate act.