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(84) :nDeriv(expression,variable,value)

This returns an approximation of the derivative at a specific value.

(89) :nDeriv(expression,variable)

This returns an approximation of the derivative. d tends to return an exact derivative, so will likely be used instead.

(84) :nDeriv(expression,variable,value,secantLength)

This returns an approximation of the derivative at a specific value. Since the numerical derivative uses a secant to determine the approximation, this allows the secantLength to be set.

(89) :nDeriv(expression,variable,secantLength)

This returns an approximation of the derivative. d tends to return an exact derivative, so will likely be used instead. Since the numerical derivative uses a secant to determine the approximation, this allows the secantLength to be set.

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