arctan 2 = ?
The arctangent is the inverse tangent function.
Since
tan 1.107 = tan 63.435º = 2
The arctangent of 2 is equal to the inverse tangent function of 2, which is equal to 1.107 radians or 63.435 degrees:
arctan 2 = tan-1 2 = 1.107 rad = 63.435º