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If f(x) = sec^-1(sin(2 tan^-1 (x))) + c...

If `f(x) = sec^-1(sin(2 tan^-1 (x))) + cosec^-1 (cos(2 tan^-1 (x)))` has m values in its domain and n values inthe range, then `(m + n)` is (A) 4 (B) 5 (C) 6 (D) none

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