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sin^−1 (2x/1+x) = 2 tan^−1 x for :

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sin−1 (2x/1+x) = 2 tan−1 x for : 

(a) |x | ≥ 1 

(b) x ≥ 0 

(c) |x | ≤ 1 

(d) all x ∈ R

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Correct option (c) |x | ≤ 1

Explanation:

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