圓函數

the trigonometric functions

circle / round / circular / spherical / (of the moon) full / unit of Chinese currency (yuan) / tactful / to make consistent and whole (the narrative of a dream or a lie)

envelope / case / letter

variant of 函[han2]

function (math.)

to count / to count as / to regard as / to enumerate (sb's shortcomings)

number / figure / several / CL:個|个[ge4]

frequently / repeatedly

(math.) elliptic function