cotan vs circular function

cotan and circular function both are nouns.

Word	Noun	Adjective	Verb	Adverb
cotan	Yes	No	No	No
circular function	Yes	No	No	No

As nouns, circular function is a hypernym of cotan; that is, circular function is a word with a broader meaning than cotan:

cotan: ratio of the adjacent to the opposite side of a right-angled triangle
circular function: function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle

Other hypernyms of cotan include trigonometric function.

cotan (noun)	circular function (noun)
ratio of the adjacent to the opposite side of a right-angled triangle	function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle