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For α , β , γ ≠ 0, if sin –1 α + sin –1 β + sin –1 γ = π and ( α + β + γ) ( α – γ + β ) = 3 αβ, then γ equals

1. 3
2. 2 3
3. 2 2 1 3 −
4. 2 1

Correct answer: 2 3

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