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Question

The domain and range is always equal for

A
Constant function
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B
Identity function
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C
Signum function
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D
None of these
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Solution

The correct option is B Identity function
For Constant function
For domain =R
Range ={c}
where c is any contant term.

For identity function
The input is always equal to output
f(x)=x
For domain =R
Range =R

For Signum function
For domain =R
Range ={1,0,1}

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