Question

How do you calculate the `arctan(1)`?

Answer 1

See explanation.

Explanation:

Arcus tangent is an inverse function to tangent so to calculate `arctan(1)` you have to find the angle `alpha` for which `tan alpha=1`

The acute angle for which `tan alpha =1` is `45^o` or `pi/4` radians, so `arctan(1)=pi/4`