Declension table of ?siddhāntarahasya

Neuter	Singular	Dual	Plural
Nominative	siddhāntarahasyam	siddhāntarahasye	siddhāntarahasyāni
Vocative	siddhāntarahasya	siddhāntarahasye	siddhāntarahasyāni
Accusative	siddhāntarahasyam	siddhāntarahasye	siddhāntarahasyāni
Instrumental	siddhāntarahasyena	siddhāntarahasyābhyām	siddhāntarahasyaiḥ
Dative	siddhāntarahasyāya	siddhāntarahasyābhyām	siddhāntarahasyebhyaḥ
Ablative	siddhāntarahasyāt	siddhāntarahasyābhyām	siddhāntarahasyebhyaḥ
Genitive	siddhāntarahasyasya	siddhāntarahasyayoḥ	siddhāntarahasyānām
Locative	siddhāntarahasye	siddhāntarahasyayoḥ	siddhāntarahasyeṣu

Compound siddhāntarahasya -

Adverb -siddhāntarahasyam -siddhāntarahasyāt