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Top Questions
24
votes
Could I ask a recommendation letter from a professor who left the university?
graduate-admissions
recommendation-letter
asked Jun 25 '17 at 19:01
academia.stackexchange.com
16
votes
How to evaluate $\sum\limits_{k=0}^{n-1} \sin^t(\pi k/2n)$?
sequences-and-series
trigonometry
complex-numbers
trigonometric-series
asked Sep 18 '16 at 20:40
math.stackexchange.com
14
votes
Why is the bond dissociation energy of C-H bond higher than that of a N-H bond?
inorganic-chemistry
bond
electronegativity
asked Sep 28 '17 at 16:25
chemistry.stackexchange.com
13
votes
Prove that $\lim_{n\rightarrow \infty} \frac{\log_{10}\lfloor\text{Denominator of } H_{10^n}\rfloor+1 }{10^n}=\log_{10} e$
limits
conjectures
open-problem
harmonic-numbers
asked May 20 '15 at 23:55
math.stackexchange.com
12
votes
Prove $\int_{-\pi}^{\pi}\sin \sin x \,dx=0$ without using the fact that $\sin(x)$ is odd.
calculus
integration
definite-integrals
asked Jan 19 '15 at 6:53
math.stackexchange.com
11
votes
Limit of recursive sequence with floor
calculus
sequences-and-series
limits
recurrence-relations
contest-math
asked Mar 16 '18 at 17:48
math.stackexchange.com
8
votes
Proving if an integral is positive, negative, or zero
calculus
integration
definite-integrals
asked Dec 31 '14 at 22:27
math.stackexchange.com
7
votes
Is $540^\circ$ a straight angle?
geometry
definition
euclidean-geometry
asked Feb 7 '15 at 23:02
math.stackexchange.com
7
votes
Prove or disprove $\int_{-\infty}^\infty \frac{dx}{\cos x+\cosh x}=\frac{1512835691 \pi}{1983703776}$
integration
improper-integrals
closed-form
asked May 29 '15 at 23:40
math.stackexchange.com
7
votes
Prove that the sum is less than $6/5$.
sequences-and-series
algebra-precalculus
summation
asked May 14 '17 at 0:33
math.stackexchange.com
1
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Top Answers
31
Number which is simultaneously sum of 2 and 3 squares
math.stackexchange.com
22
Derivative of a function w.r.t. another function.
math.stackexchange.com
18
What volume does one mole of an ideal gas occupy?
chemistry.stackexchange.com
15
A basic solution of HCl
chemistry.stackexchange.com
13
What does .9 with a line above the 9 mean?
math.stackexchange.com
13
Zeroes of a non elementary integral
math.stackexchange.com
11
Genius mathematicians who never published anything
math.stackexchange.com
11
How to solve $x^x=100$?
math.stackexchange.com
10
Where is my argument that $\int_{-1}^{1} \sqrt{1-x^2}dx=0$ wrong?
math.stackexchange.com
9
Finding the value of $f'(0)$
math.stackexchange.com
8
Why is the antiderivative of $\frac{1}{1+x^2}=\tan^{-1}(x)$?
math.stackexchange.com
8
The proper and easiest way of doing an integral with derivative?
math.stackexchange.com
8
Easy example why complex numbers are cool
math.stackexchange.com
8
Easy math proofs or visual examples to make high school students enthusiastic about math
math.stackexchange.com
7
Is this theorem already in existence?
math.stackexchange.com
7
What is the smallest unknown natural number?
math.stackexchange.com
7
What is the smallest unknown natural number?
math.stackexchange.com
7
Backward Proof of $i^2= -1$
math.stackexchange.com
7
True or False? The transformation $T$ on the set of all continuous functions that is defined by $T(f) = f (1)$ is a linear transformation.
math.stackexchange.com
7
Three odd integers from the set $\{1,3,5,7,9,11,13,15\}$ that equals to $30$.
math.stackexchange.com
7
ASCII value converter
codereview.stackexchange.com
7
Why isn't the hydroxyl group of citric acid deprotonated while the carboxyl groups are?
chemistry.stackexchange.com
6
Are logarithms the only continuous function on $(0, \infty)$ such that $f(xy) = f(x) + f(y)$?
math.stackexchange.com
6
For what values does $\sin(x+h) = \cos x$?
math.stackexchange.com
6
How to solve $12-\sin(\theta)=\cos(2\theta)$?
math.stackexchange.com
6
Evaluate $-\int \frac{dy}{y}$
math.stackexchange.com
6
Can a square be in the form $2x + 1$, when $x$ is odd?
math.stackexchange.com
6
Find the integral part of $\sum_{n=1}^{10^9} {n^{- \frac {2}{3}}}$.
math.stackexchange.com
6
How to rationalise the increasing bond length order in the carbonate ion, carbon monoxide, and carbon dioxide?
chemistry.stackexchange.com
5
Are there numbers such that A + B = 10A+B?
math.stackexchange.com
1
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