Declension table of ?tasyamāna

Neuter	Singular	Dual	Plural
Nominative	tasyamānam	tasyamāne	tasyamānāni
Vocative	tasyamāna	tasyamāne	tasyamānāni
Accusative	tasyamānam	tasyamāne	tasyamānāni
Instrumental	tasyamānena	tasyamānābhyām	tasyamānaiḥ
Dative	tasyamānāya	tasyamānābhyām	tasyamānebhyaḥ
Ablative	tasyamānāt	tasyamānābhyām	tasyamānebhyaḥ
Genitive	tasyamānasya	tasyamānayoḥ	tasyamānānām
Locative	tasyamāne	tasyamānayoḥ	tasyamāneṣu

Compound tasyamāna -

Adverb -tasyamānam -tasyamānāt