Write a function that evaluates the derivative of a function in a given point using the well-know formula of the difference quotient:
f'(x)=(f(x+h)- f(x -h))/(2*h)
radius of a spherical planet
Number of 1s in the Binary Representation of a Number
02 - Vector Variables 2
Find the index of n in magic(n)
Matlab Basics II - squares
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