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Mathematics
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Pen and Paper
  • Member for 3 years
  • Last seen more than a month ago
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17
Solve the equation $x^6-2x^5+3x^4-3x^2+2x-1=0$
Aug 31, 2022
5
Why is $\sin\left[\arctan\left(\frac{x}{a}\right)\right] = \frac{x}{a\sqrt{\frac{x^2}{a^2} + 1}}$ true?
Dec 9, 2021
4
Binomial/combinatorics summation proof question
Jul 21, 2021
4
Finding the value of $\frac{1}{z_1-z_2}+\frac{1}{z_2-z_3}+...+\frac{1}{z_7-z_1}$
Mar 7, 2023
4
A question on proving that $e$ is irrational
Jul 23, 2021
4
What am I doing wrong with this Euler substitution?
Mar 3, 2022
4
Fastest way to find $\cos{6\theta}$ or higher in terms of powers of $\cos$
Oct 19, 2021
4
Don't understand a line for the proof of $\displaystyle \sum_{1≤k≤n}\frac{\sin{kx}}{k}≥0$
Feb 7, 2022
3
Prove that: $\sum_{i=1}^{5}x_i\sum_{i=1}^{5}\frac {1}{x_i}\leq 25$
Dec 18, 2022
3
Find all roots of $p(z)=z^6+z^3-6$
Sep 30, 2021
Top network posts
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8
Is doubling the «que» a thing in French?
7
Could someone identify this word in the phrase "Die ____ grüßen den Führer"?
6
Why is it «du hasard» instead of «au hasard» in this context?
5
Why is « en » used in this context?
5
Why does Hugo use « d'elle-même » instead of « elle-même »