Declension table of ?sandhyāvandanamantra

Masculine	Singular	Dual	Plural
Nominative	sandhyāvandanamantraḥ	sandhyāvandanamantrau	sandhyāvandanamantrāḥ
Vocative	sandhyāvandanamantra	sandhyāvandanamantrau	sandhyāvandanamantrāḥ
Accusative	sandhyāvandanamantram	sandhyāvandanamantrau	sandhyāvandanamantrān
Instrumental	sandhyāvandanamantreṇa	sandhyāvandanamantrābhyām	sandhyāvandanamantraiḥ sandhyāvandanamantrebhiḥ
Dative	sandhyāvandanamantrāya	sandhyāvandanamantrābhyām	sandhyāvandanamantrebhyaḥ
Ablative	sandhyāvandanamantrāt	sandhyāvandanamantrābhyām	sandhyāvandanamantrebhyaḥ
Genitive	sandhyāvandanamantrasya	sandhyāvandanamantrayoḥ	sandhyāvandanamantrāṇām
Locative	sandhyāvandanamantre	sandhyāvandanamantrayoḥ	sandhyāvandanamantreṣu

Compound sandhyāvandanamantra -

Adverb -sandhyāvandanamantram -sandhyāvandanamantrāt