What does it mean graphically if a function is twice differentiable
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Intuitive characterization of the graph of a twice differentiable function
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Notation of the second derivative - Where does the d go?
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How to show that $f$ is differentiable at $x=0.$
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Geometric interpretation of $\frac {\partial^2} {\partial x \partial y} f(x,y)$
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second derivative of the inverse function
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Suppose f is a twice differentiable function with $f(0)=0$ and $f(1)=1$, $f'(0)=f'(1)=0$. Then show that $|f''(x)| > 4$ for some $x$ in $(0,1)$
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Geometrical Meaning of derivative of complex function
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Differentiating both sides of a non-differential equation
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Differentiating $y=x^{2}$
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If $f\colon \mathbb{R} \to \mathbb{R}$ is such that $f(x+y)=f(x)f(y)$ and $f'(0)$ exists, then $f$ is differentiable on $\mathbb R$
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Showing that a function is differentiable
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Derivative of an even function is odd and vice versa
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What can we say about differentiability of $f$ at $c$?
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What is the meaning of the third derivative of a function at a point
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If $f+g$ and $f$ are differentiable at $a$, must $g$ be differentiable at $a$?
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half-derivative of $x^2$
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Quick question on multivariate differentiation