atan(−i)=−i∞
 TeX:
\operatorname{atan}\!\left(-i\right) = -i \inftyDefinitions:
| Fungrim symbol |  Notation |  Short description | 
|---|
| Atan | atan(z)
 | Inverse tangent | 
| ConstI | i
 | Imaginary unit | 
| Infinity | ∞
 | Positive infinity | 
Source code for this entry:
Entry(ID("9b0994"),
    Formula(Equal(Atan(Neg(ConstI)), Mul(Neg(ConstI), Infinity))))