d/dx 2x^2 = 4x
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-2
It is -2*exp(-2x)
2
All it means to take the second derivative is to take the derivative of a function twice. For example, say you start with the function y=x2+2x The first derivative would be 2x+2 But when you take the derivative the first derivative you get the second derivative which would be 2
7x2 -4x -5x2 +2x = 2x2 -2x