Problem 42588. Derivative function
Given a function handle f, generate a function that evaluates the derivative of f
Examples:
f = @sin; df = Derivative(f); df([0 pi]) ans = 1 -1
Derivative of sin is cos, cos([0 pi]) = [1 -1]
Hint(Added 2015/9/17): https://en.wikipedia.org/wiki/Numerical_differentiation
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