I'm completely lost. I've been trying to use cot(x)=1/tan x. I just don't understand what this means at all.
It is an identity. A bit like how cos^2(x) + sin^2(x) is the same as 1. Replacing cot(x) with 1/tan(x) does not change the equation whatsoever, therefore it is important to use it.
cot(x) = - 1/rt(3)
means
1/tan(x) = - 1/rt(3)
which means
tan(x) = - rt(3)
and this is something you can proceed to solve as normal.
It is an identity. A bit like how cos^2(x) + sin^2(x) is the same as 1. Replacing cot(x) with 1/tan(x) does not change the equation whatsoever, therefore it is important to use it.
cot(x) = - 1/rt(3)
means
1/tan(x) = - 1/rt(3)
which means
tan(x) = - rt(3)
and this is something you can proceed to solve as normal.