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The domain of the function f defined by

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The domain of the function f defined by

f (x) = √(4-x) + 1/√(x2-1) is equal to

(A) (– ∞, – 1) ∪ (1, 4] 

(B) (– ∞, – 1] ∪ (1, 4]

(C) (– ∞, – 1) ∪ [1, 4] 

(D) (– ∞, – 1) ∪ [1, 4)

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Best answer

Answer is (A) 

We have, f (x) = √(4-x) + 1/√(x2-1)

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