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A function that maps an input onto itself is called an identity function. In other words, the output of the function is the same as the input. The identity function is represented by the equation f(x) = x.
x2 - y2 = (x + y)(x - y) is an identity, not a function.
Identity of addition means the answer and then add
An identity is like an equation which is true for all values of the variable.
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