Find the principal value of cot^(-1)(-sqrt(3))

In this video, we learn to find the principal value of verify cot^(-1)(-sqrt(3)). cot^(-1)(-sqrt(3)) can also be written as arccot(-sqrt(3)).

The following video link verifies the trigonometry identity cot(pi - x) = - cot x

Other topics of this video are:
Find the exact value of cot^(-1)(-sqrt(3))
Find the exact value of arccot(-sqrt(3))
What is the exact value of cot^(-1)(-sqrt(3))?

I, Ravi Ranjan Kumar Singh, have produced this video. All credits of this video belong to me.