A shorcut to check differentiability at a point
1371
Prove that $f'(a)=\lim_{x\rightarrow a}f'(x)$.
103241
A function that is continuous at the origin but not differentiable there
93528
Continuous versus differentiable
29589
How can I differentiate numerically?
154881
Question on differentiability of a continuous function
53497
Prove that the function is continuous and differentiable (not as easy as it sounds imo)
158681
How to show that $e^x$ is differentiable?
147758
Differentiable but not continuously differentiable.
17452
Is differentiating on both sides of an equation allowed?
55268
Differentiable and Continuous functions on [0,1] with 'weird' conditions.
72702
Estimate on the derivative at fixed point
150833
Discontinuities of the derivative of a differentiable function on closed interval
90295
Taking the second derivative of a parametric curve
131145
Measuring a curve with Dirac delta function.
18734
Showing that a function is differentiable
6417
Can a function be differentiable at the end points of its (closed interval) domain?
127114
Differentiability implying continuity