Question

How do you use a calculator to evaluate `tan^-1 3.9` in both radians and degree?

Answer 1

`75^@62`
`(75.62pi)/180`
`(265^@62pi)/180`

Explanation:

Calculator and unit circle give:
tan x = 3.9 --> 2 solutions -->
`x = 75^@62`, and `x = 180 + 75.62 = 255^@62`
Convert to radians:
`180^@ --> pi`
`1^@ ---> pi/180`
`x = 75^@62 ---> (75.62(pi))/180`
`x = 255^@62 = (255.62pi)/180`