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Range of f (x)

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Range of f(x) = 1/(1-2cosx) is

(A) [1/3, 1]

(B) [-1, 1/3]

(C) (– ∞, –1] ∪ [1/3, ∞]

(D) [-1/3, 1]

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1 Answer

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Answer is (C)

We know that, -1 ≤ cos x ≤ 1

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