- Arc sine
the angle, measured in radians, that has a sine equal to a given number. Symbol: sin −1. Abbreviation: arc sin; arc sine The inverse of the sine function.
- Arc spectrum
a spectrum formed from the light produced by an electric arc, characteristic of the gas or vapor through which the arc passes.
- Arc tan
. arc tangent
- Arc tangent
the angle, measured in radians, that has a tangent equal to a given number. Symbol: tan −1. Abbreviation: arc tan; arc tangent The inverse of the tangent function.