Declension table of ?brahmasiddhānta

Masculine	Singular	Dual	Plural
Nominative	brahmasiddhāntaḥ	brahmasiddhāntau	brahmasiddhāntāḥ
Vocative	brahmasiddhānta	brahmasiddhāntau	brahmasiddhāntāḥ
Accusative	brahmasiddhāntam	brahmasiddhāntau	brahmasiddhāntān
Instrumental	brahmasiddhāntena	brahmasiddhāntābhyām	brahmasiddhāntaiḥ brahmasiddhāntebhiḥ
Dative	brahmasiddhāntāya	brahmasiddhāntābhyām	brahmasiddhāntebhyaḥ
Ablative	brahmasiddhāntāt	brahmasiddhāntābhyām	brahmasiddhāntebhyaḥ
Genitive	brahmasiddhāntasya	brahmasiddhāntayoḥ	brahmasiddhāntānām
Locative	brahmasiddhānte	brahmasiddhāntayoḥ	brahmasiddhānteṣu

Compound brahmasiddhānta -

Adverb -brahmasiddhāntam -brahmasiddhāntāt