Declension table of ?prasannamukha

Masculine	Singular	Dual	Plural
Nominative	prasannamukhaḥ	prasannamukhau	prasannamukhāḥ
Vocative	prasannamukha	prasannamukhau	prasannamukhāḥ
Accusative	prasannamukham	prasannamukhau	prasannamukhān
Instrumental	prasannamukhena	prasannamukhābhyām	prasannamukhaiḥ prasannamukhebhiḥ
Dative	prasannamukhāya	prasannamukhābhyām	prasannamukhebhyaḥ
Ablative	prasannamukhāt	prasannamukhābhyām	prasannamukhebhyaḥ
Genitive	prasannamukhasya	prasannamukhayoḥ	prasannamukhānām
Locative	prasannamukhe	prasannamukhayoḥ	prasannamukheṣu

Compound prasannamukha -

Adverb -prasannamukham -prasannamukhāt