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The solution set of values of x satisfying equation 2cot^-1x + cos ^-1(1 - x^2/1 + x^2) = π, is

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The solution set of values of x satisfying equation 2cot-1x + cos -1(1 - x2/1 + x2) = π, is

(A) all real numbers

(B) (-∞ , 0)

(C) [0, ∞) 

(D) (-∞ , -1) ∪ (1, ∞)

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Correct option  (C) [0, ∞) 

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