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Tutoring and Teaching Approach to Differential CalculusIn calculus the concepts of variables, functions and rates of change of functions are of fundamental importance. A variable often denoted by x, y, z or t, is a quantity that is able to vary: as opposed to a constant such as 1, 2, -3, etc., which are fixed numbers. So remember that a variable is able to vary. Numerically a function may be thought of as a relationship between two variables, the independent variable and the dependent variabl