If A = [cosθ sinθ; −sinθ cosθ], then |adj A| is:
If A = [cosθ sinθ; −sinθ cosθ], then |adj A| is:
- A. 1
- B. cos²θ + sin²θ
- C. 0
- D. 2
Answer: A) 1
Explanation: |A| = cos²θ + sin²θ = 1. For 2×2, |adj A| = |A|^(2−1) = |A| = 1.
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