Thread: Cotangent pi/2

I know that

Tan(0) = 0
Tan(pi/4) = 1
tan(pi/2) = undefined

Cot(0) = 1/0 = undefined
Cot(pi/4) = 1/1 = 1


Cot(pi/2) = This is the one I am stuck at.
Since it equals 1/undefined. What happens?

Oh I see how it works.