arctangent
noun
arc·tan·gent (ˌ)ärk-ˈtan-jənt 
variants or less commonly arc tangent
plural arctangents also arc tangents
: the inverse function of the tangent
if y is the tangent of θ, then θ is the arctangent of y
—abbreviation arctan 
Word History
First Known Use
1886, in the meaning defined above
- takes off (from)
- takes off (on)
- takes off after
- takes off from
- takes off on
- takes on
- takes one's time
- takes out
- takes out on
- takes out on someone
- takes over
- takes ship
- takes something out on
- takes something out on someone
- takes the count
- takes the floor
- takes the mickey out of
- takes to
- takes to task
- takes to the cleaners
- takes up
- takes up with
- Takeshita
- taketh
- takeups