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Mathematics
Li Kwok Keung's user avatar
Li Kwok Keung's user avatar
Li Kwok Keung's user avatar
Li Kwok Keung
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9
The least value of $f(x)$=$\sqrt{x^2-2x+2}+\sqrt{x^2-4x+29}$
Nov 6, 2022
8
Prove that $\sqrt 2 + \sqrt[3]2$ is not rational
Jul 29, 2022
8
$\tan^2\left(\dfrac{\pi}{16} \right)+\tan^2\left(\dfrac{3\pi}{16} \right)+\tan^2\left(\dfrac{5\pi}{16} \right)+\tan^2\left(\dfrac{7\pi}{16} \right)$
Jan 30, 2023
7
Find nature of triangle knowing that $a^3+b^3+c^3=3abc$
Oct 13, 2023
7
Question about isosceles triangle
Jul 17, 2023
7
Dividing 100 members into two groups.
Oct 16, 2022
7
Let $A,B$ be $2$ square matrices such that $A+AB-2B=0$. Prove $2$ isn't an eigenvalue of $A$.
Sep 30, 2023
7
How to find the minimum of $x^4+y^4+x^3+y^3+x^2+y^2$?
Sep 29, 2023
6
In $\triangle ABC$, $AD$ is the altitude and $CE$ is the bisector. Find $\angle EDB$ if $\angle CEA = 45^\circ$.
Oct 28, 2023
5
Inscribed triangles and area
Jan 20, 2023