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Let the function f:9R to 9R be defined b...

Let the function `f:9R to 9R` be defined by `f(x)=2x+sin` for all `x in 9R`. Then `f(x)` is

A

One-to-one and onto

B

One-to-one but not onto

C

One-to-one but not onto

D

Neither one-to-one nor onto

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