Functions with the same derivatives
10431
Prove that $C\exp(x)$ is the only set of functions for which $f(x) = f'(x)$
20280
Proving that expression is equivalent to the definition of derivative
151947
Finding a pair of functions with properties
134871
Using definition of derivative to differentiate $f(x)= \sqrt{x}+1$
88603
verify equicontinuous functions
104044
Prove continuous functions $f$ and $g$ are equal
53640
Equality of mixed partial derivatives
30836
Derivative of a determinant whose entries are functions
11322
Show that $f$ vanishes identically.
59279
Example of function that is differentiable, but the second derivative is not defined
113343
$f$ is constant if derivative equals zero
76889
How do I evaluate several n-th derivatives of a function at one point?
66639
Second Derivative
56032
How come $\frac{1}{1-x}$ and $\frac{x}{1-x}$ have the same derivative?
55268
Differentiable and Continuous functions on [0,1] with 'weird' conditions.
106212
Multiple derivative notation
38192
Derivative of inverse function at a point.