Question

How do you evaluate `arctan(2)`?

Answer 1

`x = 63^@43 + k180^@`

Explanation:

Use calculator and unit circle
tan x = 2 --> calculator --> arc `x = 63^@43`
Unit circle gives another arc x that has the same tan value:
`x = 63^@43 + 180^@ = 243^@43`
Answers for (0, 360):
`63^@43, 243^@43`
General answers:
`x = 63^@43 + k180^@`