The domain of F (x + 3) is [2,3], (1) the domain of F (x); (2) the domain of F (X-2)
1. The domain of F (x) is [5,6], take 2 + 3,3 + 3
2. The domain of F (X-2) is [7,8], take 5 + 2,6 + 2
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