cotan vs cotangent

cotan and cotangent both are nouns.

Word	Noun	Adjective	Verb	Adverb
cotan	Yes	No	No	No
cotangent	Yes	No	No	No

As nouns, cotan and cotangent are synonyms defined as:

cotan and cotangent: ratio of the adjacent to the opposite side of a right-angled triangle

cotan (noun)	cotangent (noun)
ratio of the adjacent to the opposite side of a right-angled triangle	ratio of the adjacent to the opposite side of a right-angled triangle