Algebra-2

Question Analysis
This problem evaluates the ability to find all solutions to a trigonometric equation within a given interval.

Key Concept Explanation
The cosine function, , is zero at specific points within one period. In the interval , these points are and . To find all solutions in the interval , we need to consider the periodicity of the cosine function.

Step-by-step Solution
1. Identify the points where in one period: and .
2. Extend these points to the interval

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