Question

How do you calculate `cot^-1(-5)`?

Answer 1

Calculate `cot^-1 (-5)`

Ans: `-11^@31 + k180`

Explanation:

cot x= 1/(tan x). First, find tan x.
Use calculator -->
tan x = 1/(cot) = -1/5 = -0.2 --> arc `x = - 11^@31. + k180`

k = 1 --> x = 168.69
k = 2 --> x = 348.69