What is wrong with this derivation of $\frac{d}{dx}x^2$?
1002
Where is the flaw in this "proof" that 1=2? (Derivative of repeated addition)
20962
Derivation of Archimedes' principle
43385
Why is $\frac{\operatorname dy'}{\operatorname dy}$ zero, since $y'$ depends on $y$?
154491
Evaluate $\int \frac{\sqrt{x^2-1}}{x} \mathrm{d}x$
39995
Showing that partial derivatives of $f(x) = \frac{xy}{x^2+y^2}$ exist for $(x,y) \neq (0,0)$
73099
Why is $d(x^2)= 2xdx$?
19561
Why is $\frac{1}{\frac{1}{X}}=X$?
85984
How come $\frac{\partial(\partial_{\beta}A_{\gamma})}{\partial(\partial_{\mu}A_{\nu})} = g_{\beta\mu}g_{\gamma\nu}$?
102279
Derivative of Quadratic Form
139534
Derivative of determinant, which is correct?
63191
What is the $k-$th derivative of $ \frac{1}{1-x^2}$?
23319
How to disprove this fallacy that derivatives of $x^2$ and $x+x+x+\dots\quad(x\text{ times})$ are not same.
56424
Using D to find a symbolic derivative
150890
Evaluating $\int_{\mathbb{R}}\frac{\exp(-x^2)}{1+x^2}\,\mathrm{d}x$
153794
What is the meaning of $1/(D+a)$, where $D$ is the derivative operator?
128355
Does $e^{tx} + x = t - 1$ yield a solution/s to $\frac{dx}{dt} = \frac{e^{-tx} - x}{e^{-tx} + t}$?
114505
Initial value problem $t\frac{dx}{dt}=x+\sqrt{t^2+x^2}$