The "notational second derivative" is true only when the function 𝑓(𝑥) is of a very specific form 
pic.twitter.com/ZFTgHFcqxp
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The way to solve it is shown (picture might be see-through?)pic.twitter.com/WTy0cR23pq
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how do u do it
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App called FormulaBox. I rarely have my computer at hand
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