Declension table of ?phaṇitavya

Masculine	Singular	Dual	Plural
Nominative	phaṇitavyaḥ	phaṇitavyau	phaṇitavyāḥ
Vocative	phaṇitavya	phaṇitavyau	phaṇitavyāḥ
Accusative	phaṇitavyam	phaṇitavyau	phaṇitavyān
Instrumental	phaṇitavyena	phaṇitavyābhyām	phaṇitavyaiḥ phaṇitavyebhiḥ
Dative	phaṇitavyāya	phaṇitavyābhyām	phaṇitavyebhyaḥ
Ablative	phaṇitavyāt	phaṇitavyābhyām	phaṇitavyebhyaḥ
Genitive	phaṇitavyasya	phaṇitavyayoḥ	phaṇitavyānām
Locative	phaṇitavye	phaṇitavyayoḥ	phaṇitavyeṣu

Compound phaṇitavya -

Adverb -phaṇitavyam -phaṇitavyāt