Question

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

Answer 1

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

Explanation:

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)#