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Mathematics
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RDK
  • Member for 3 years, 2 months
  • Last seen this week
  • Seoul, Republic of Korea
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About

Ι’m a Korean High—Schooler, and also a great fan of Mathematics and Programming.

Ι’m especially fascinated with Functional Equations, Equations of Motion in Math, and Python, Clang in Programming.

My Activation Time: 17:00~02:00, KST(Inactive in Exam Terms)

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question
12
Show that no non-zero integers satisfy this pair of equations (from Baltic Way 2021)
Jun 27, 2022
answer
10
Proving irreducibility for $\frac{a^2+b^2}{ac+bd}$
Jul 2, 2022
answer
10
If $z=-\dfrac12-\dfrac{\sqrt{3}}{{2}}i$, find the value of $z^4+z^8$.
Nov 24, 2021
question
7
How much do we have to do this action to make this triangle equilateral?
Jul 12, 2022
answer
6
how to calculate the area of ​the painted circle?
Jun 11, 2022
answer
6
Finding $x-\frac{1}{x}$, given $x^3 - \frac{1}{x^3} = 108+76\sqrt{2}$
Oct 18, 2022
answer
5
With $x_1^2+3x_2^2+2x_1x_2=32$, find max value of $|x_1-x_2|$
Jul 4, 2022
question
4
$f: \Bbb{R} \to \Bbb{R_0^+}, f(x+2y)+f(x)=2(f(x+y)+f(y)).$
Aug 27, 2022
question
4
Finding all the surjective functions $ f: \mathbb{R} \to \mathbb{R}$ which satisfy $f(x+f(x)+xy)=2f(x)+xf(y) \ \forall x, y \in \mathbb{R}$
Oct 18, 2021
question
4
Prove that $\sum_{cyc} \frac {a^3+3b^3}{5a+b} \geq \frac 2 3 (a^2+b^2+c^2) \text{ for } a, b, c \in \mathbb{R^+}$
Oct 27, 2021
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Is it a duplicate if the same question exists in another site?
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