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• 40 What is the tangent at a sharp point on a curve?
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• 13 Does Euler's formula give $e^{-ix}=\cos(x) -i\sin(x)$?
• 9 Where does $\pi^2$ appear spontaneously within Physical Phenomenon and Mathematics Equations?
• 8 Why we say $i^2 = -1$ while it is $1$
• 8 L'Hopital's rule conditions
• 7 Graphing the binomial coefficients: appearances?
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