What is wrong in calculation of the derivative by this method?
23319
How to disprove this fallacy that derivatives of $x^2$ and $x+x+x+\dots\quad(x\text{ times})$ are not same.
8711
Problems in the relation $a=v\frac{\mathrm{d}v}{\mathrm{d}x}$
107572
How does the derivative with respect to the complex conjugate even make sense?
134122
When is differentiating an equation valid?
95598
Derivative of unit step function?
139534
Derivative of determinant, which is correct?
119907
Finding the Derivative of |x| using the Limit Definition
124341
HeavisideTheta integration of derivative
27782
Why does this proof of the chain rule not work?
36990
Notation of the second derivative - Where does the d go?
123532
An incorrect answer for an integral
11385
Using the Limit definition to find the derivative of $e^x$
57875
Derivative of function solved from NDSolve can't be plotted
48968
What is wrong with this chi-squared calculation?
104206
How to find the nth derivative?
30723
Second derivative "formula derivation"
151864
Derivative of the Absolute Value Function in Mathematica looks very different from the actual answer