Declension table of ?tapasyitavya

Neuter	Singular	Dual	Plural
Nominative	tapasyitavyam	tapasyitavye	tapasyitavyāni
Vocative	tapasyitavya	tapasyitavye	tapasyitavyāni
Accusative	tapasyitavyam	tapasyitavye	tapasyitavyāni
Instrumental	tapasyitavyena	tapasyitavyābhyām	tapasyitavyaiḥ
Dative	tapasyitavyāya	tapasyitavyābhyām	tapasyitavyebhyaḥ
Ablative	tapasyitavyāt	tapasyitavyābhyām	tapasyitavyebhyaḥ
Genitive	tapasyitavyasya	tapasyitavyayoḥ	tapasyitavyānām
Locative	tapasyitavye	tapasyitavyayoḥ	tapasyitavyeṣu

Compound tapasyitavya -

Adverb -tapasyitavyam -tapasyitavyāt