Answer:
Explanation:
Given the cosine equation:
Let:
Then we will have:
We know that cosθ is negative in second quadrant and third quadrant.
In second quadrant:
In third quadrant:
Therefore, we will have two solutions where:
Convert from theta back to the original expression:
Convert two equations into one:
Since you do not specify the interval, add
where
.
Solve the equation for x:
Therefore, the solution is: