Algebra-2

Question Analysis
This problem tests the ability to find the reference angle for an angle in the second quadrant.

Key Concept Explanation
The reference angle is the smallest angle formed between the terminal side of an angle and the x-axis. For angles in the second quadrant, the reference angle is calculated by subtracting the given angle from .

Step-by-step Solution
1. Identify the given angle: .
2. Subtract the given angle from

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