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Let X and Y be two non-empty sets. A function from X into Y is a relation that associates with each element of X exactly one element of Y. Let R be the set of real numbers. The functions we are interested in are functions from R into R (Real Functions). In this video I give you examples of the most common real functions ,their graphs, domain and range, like: linear, quadratic, cubic, square root, cubic root, absolute value and the reciprocal.