Why does $\frac{dT}{Ld\theta} = \frac{L}{1}$ in this picture, and why are the two triangles similar in the limit as $d\theta$ tends to $0$?
2676
Finding $\frac {d(\tan \theta)}{d\theta}$
36990
Notation of the second derivative - Where does the d go?
3360
Is $\frac{\textrm{d}y}{\textrm{d}x}$ not a ratio?
151977
Dirac delta function as a limit of sinc function
100866
Why is $\int_{0}^{\infty} \frac {\ln x}{1+x^2} \mathrm{d}x =0$?
34650
Explain why $\int_0^\infty\frac{\sin{4x}}{x}\prod\limits_{k=1}^n \cos\left(\frac{x}{k}\right) dx\approx\frac{\pi}{2}$
36586
Evaluating $\frac{1}{2\pi}\int_{0}^{2\pi}\frac{1}{1-2t\cos\theta +t^2}d\theta$
84413
Why is $\int_{-\infty}^\infty |g(x)|\,dx = \int_0^\infty \mu(\{x : |g(x)| \ge t\})\,dt$ true?
90684
confusion about the laplacian in polar coordinates
111596
Epsilon Delta Limit Intuition
83532
Confusion I have regarding Einstein's 1905 derivation of LT
23836
Rigorous proof that $\frac{1}{3} = 0.333\ldots$
152895
What is wrong with this derivation of $\frac{d}{dx}x^2$?
96039
Why is $\frac {1\cdot2\cdot3\cdot...\cdot n}{(n+1)(n+2)...(2n)}\le \frac 1 {n+1}$
46358
geometric interpretation of $\vec v \cdot \operatorname{curl} \vec v = 0 $
67894
$\epsilon$-$\delta$ proof that $\lim\limits_{x \to 1} \frac{1}{x} = 1$.
43385
Why is $\frac{\operatorname dy'}{\operatorname dy}$ zero, since $y'$ depends on $y$?