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:<math>\lim_{x \to \partial x} {\partial y\over \partial x} = \lim_{x \to \partial x} {f (x + \partial x) - f(x) \over \partial x} </math>
:<math>\lim_{x \to \partial x} {\partial y\over \partial x} = {dy /over dx} = \lim_{x \to \partial x} {f (x + \partial x) - f(x) \over \partial x} = f(x)^-1 </math>
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