Algebra-2

Question Analysis
This problem assesses the understanding of the periodicity and symmetry of the cosine function, specifically finding all values of in a given interval where equals a specific value.

Key Concept Explanation
The cosine function is periodic with a period of . It is also an even function, meaning . The key points in one period from to are:

Step-by-step Solution
1. Identify the first solution in the interval :

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