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Question

Which of the following functions are into functions if they are all defined from R to R?

A
f(x)=sin x
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B
f(x)=cos x
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C
f(x)=ex
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D
f(x)=x3
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Solution

The correct option is C f(x)=ex

If the range of a function is a proper subset of the co-domain, then the function is into.

Consider f(x)=sin x.
We know that the range of sin x is [1,1].
Thus, range co-domain.
i.e., There are elements in the co-domain that have no pre-images. Thus, the function is into.

Consider f(x)=cos x.
We know that the range of cos x is [1,1]. Since range co-domain, the function is into.

Consider f(x)=ex. This function ranges from (0,) and thus, range co-domain. Therefore, the function is into.

Lastly, f(x)=x3. has R as its range and co-domain. Therefore, it is not an into function.


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