Declension table of ?prasannatarka

Neuter	Singular	Dual	Plural
Nominative	prasannatarkam	prasannatarke	prasannatarkāṇi
Vocative	prasannatarka	prasannatarke	prasannatarkāṇi
Accusative	prasannatarkam	prasannatarke	prasannatarkāṇi
Instrumental	prasannatarkeṇa	prasannatarkābhyām	prasannatarkaiḥ
Dative	prasannatarkāya	prasannatarkābhyām	prasannatarkebhyaḥ
Ablative	prasannatarkāt	prasannatarkābhyām	prasannatarkebhyaḥ
Genitive	prasannatarkasya	prasannatarkayoḥ	prasannatarkāṇām
Locative	prasannatarke	prasannatarkayoḥ	prasannatarkeṣu

Compound prasannatarka -

Adverb -prasannatarkam -prasannatarkāt