Question

Question #b890c

Answer 1

25 + k360
215 + k360

Explanation:

Calculator and trig unit circle -->
cos (x + 60) = 0.0872
`x + 60 = +- 85^@`

a. x + 60 = 85 -->
`x = 85 - 60 = 25^@`
b. x + 60 = - 85
`x = - 85 - 60 = - 145^@` , or
`x = 360 - 145 = 215^@` (co-terminal)
General answers;
`x = 25^@ + k360`
`x = 215^@ + k360`