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TeM
  • Member for 7 years, 3 months
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  • Brentonico (TN)
33 votes
2 answers
3k views

On the convergence of $\sum_{n = 1}^\infty\frac{\sin\left(n^a\right)}{n^b}$

17 votes
8 answers
3k views

Definite integral $\int_0^1 \frac{\arctan x}{x\,\sqrt{1-x^2}}\,\text{d}x$

10 votes
1 answer
677 views

Parametric equation for a space curve

10 votes
5 answers
333 views

How to factor $x^6+x^5-3\,x^4+2\,x^3+3\,x^2+x-1$ by hand?

9 votes
3 answers
517 views

Evaluate the definite integral $\int_0^{2\pi}\arctan\left((a\cos x + b\sin x)^2\right)dx$

6 votes
1 answer
210 views

A particular integral: $\int_{-\infty}^{+\infty}\frac{\sin(\pi x)}{\prod_{k=-n}^{n}(x-k)}\,dx$

4 votes
1 answer
219 views

Series with non-negative terms: $\sum_{n=1}^{\infty} \frac{|\cos n|^n}{n}$ [duplicate]

3 votes
1 answer
930 views

Clairaut's theorem is reversible?

2 votes
3 answers
57 views

Prove that a series converges if $|a_n|<1$

2 votes
1 answer
128 views

Hexagon not regular

1 vote
2 answers
2k views

Moment of inertia of regular polygonal frames

1 vote
2 answers
116 views

Integral without numerical calculation of $ I = \int_{0}^{\frac{\pi}{2}} \frac{\sin\left(4\,\cos^2\theta\right)}{2}\,\text{d}\theta$

1 vote
1 answer
1k views

Semidefinite matrix or indefinite?

1 vote
3 answers
208 views

Calculation of an infinite sum $\sum_{k=1}^{\infty} \frac{k^3}{2^k} = 26$ [closed]

1 vote
4 answers
6k views

Prove by induction that sum of an odd number of odd numbers is odd

1 vote
1 answer
336 views

Hessian null - Point of saddle

0 votes
2 answers
268 views

Proof equivalence relation

0 votes
1 answer
92 views

About absolute error calculation

0 votes
0 answers
84 views

Finding the radius of convergence with limsup

0 votes
2 answers
575 views

Function of three variables - Hessian zero

0 votes
1 answer
37 views

Numerical series in terms of alternating sign

0 votes
2 answers
331 views

Each saddle point is a isolated critical point?

0 votes
1 answer
90 views

Series of $(\arctan(\cos n))^n$

0 votes
3 answers
56 views

Problem about the similarity between triangles

-1 votes
1 answer
89 views

Code Wolfram Mathematica [closed]

-1 votes
1 answer
61 views

Graph of the square root of a function [closed]