How do you evaluate $arc cot(-2)$ on the Scientific Calculator?

Question

14677 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-07-15T14:10:39

Use $arc cot (-2)=arc tan(-1/2)$

If a = cot b, tan b = 1/cot b = 1/a#

Here $arc cot (-2)$ is the angle whose cotangent is (-2) = angle

whose tangent is (-1/2) = arc tan (-1/2)#

How do you evaluate arc cot(-2)arc cot(-2) on the Scientific Calculator?