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Which of the following functions is an i...

Which of the following functions is an injective (one-one) function in its respective domain? (A) `f(x) = 2x + sin 3x ` (B) `x. [x]` , (where `[.]` denotes the G.I.F) (C) `f(x)=(2^x-1)/(4^x+1)` (D) `f(x)=(2^x+1)/(4^x-1)`

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