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Nicolò Vignatavan - Limit definition of derivative

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DERIVATIVES: the limit definition Nicolò Vignatavan ->  Video According to traditional mathematics, the derivative of a function at one of its points "Xo" is infinitesimally equivalent to the incremental ratio [f(Xo + h) - f(Xo)] / h, with "h" meaning "Delta x", or in other words,   the difference between the abscissa of the upper extremity, in direction x of the segment of dimension "h", constructed starting from "Xo" and the same lower extremity point "Xo" and "[f (Xo + h ) - f (Xo)] "   is understood as   " Delta y ", with " f (Xo + h) "   and " f (Xo) considered respectively as the images on the axis of the ordinates of the two extreme points in denominator, with h tending to 0. In these terms, assuming a secant line to the function precisely at the ordinate points "f (Xo + h)" and "f (Xo)", considered as the i