Question

Which of the following function is identity function?

• A. y =$x^2$
• B. y=$\frac{1}{x}$
• C. y = 1
• D. y = x

Answer 1

The correct option is D

y = x

The name of the function y = x is identity function.

This is different from identical functions.

Two functions are said to be identical if both have same domain and range.