Question

Please help with trigonometric equation

Answer 1

http://puu.sh/9HL4i/145a1e3810.png

Answer 2

by the way those are the answers, i calculated the first 2 but i don't understand the next 2.

Answer 3

you get the next 2 by adding pi

\[2x = \cos^{-1} (.6) +2\pi n\]
\[x = \frac{\cos^{-1} (.6)}{2} +\pi n\]

Answer 4

Hey thanks but i don't understand why is there more than 2 results.
The trig graph is something like this right