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Considering only the principal values of inverse functions, the set ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ π = + ≥ = − − 4 ) x 3 ( tan ) x 2 ( tan : 0 x A 1 1

1. contains two elements
2. contains more than two elements
3. is an empty set
4. is a singleton

Correct answer: is a singleton

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