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)
frame of the matrix
Find the hypotenuse
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Reshape a Vector
Finding perimeter of a rectangle
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