what is double differentiation
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Concavity. The second derivative of a function f measures the concavity of the graph of f. A function whosesecond derivative is positive will be concave up (also referred to as convex), meaning that the tangent line will lie below the graph of the function.
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Double differentiation is just rate of change of rate of change of a function. or we can say it is slope of slope. In simple word: Double differentiation is rate of change of slop. Geometrically: A second derivative is used to determine concavity. If you get a positive, it tells you that the graph 'opens up'
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