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14-02-2024
Mathematics

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Let f:R→ (0,π/2) be a function defines by f(x) = cot-1 (x²+4x+a²-α²-α), complate set of values of α for which f(x) is onto, is
A. [1-√17/2,1+√17/2]
B. (-[infinity], 1-√17/2] ∪ [1+√17/2,[infinity])
C. (1-√17/2,1+√17/2)
D. None of these

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