A more formal understanding of functions

Multiple Choice Questions
Which of the following function is identical to function, f(x)=x². Select the correct option.
What is a domain of a function? Select the correct option.
What is called as a subset of codomain that the function actually maps to? Select the correct option.
g : R²→R Find the range of the following function.
Evaluate the function f(x, y) for (2,3) f(x,y) = (x+y, y-x, yx) Select the correct option.
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