Mathematics
Wang YeFei's user avatar
Wang YeFei's user avatar
Wang YeFei's user avatar
Wang YeFei
  • Member for 2 years, 4 months
  • Last seen this week
  • Chengdu, Sichuan, China
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About

An automotive technician with an immense interest in math and tutoring K-12 kids in geometry and algebra. I am also a student of Jiujitsu .

Note: I am here to gain the math knowledge and not to concern about points ( up or down vote thing )

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View all questions and answers
All Questions Answers
Score Newest
answer
10
What is maximum value of $f(t)=16\cos t \cdot \cos 2t \cdot\cos 3t \cdot \cos6t$
May 30, 2022
answer
7
Integral inequality, proof verification
Dec 30, 2021
answer
7
Are the positive irrational numbers closed under addition?
Aug 11, 2022
answer
7
How to show that $\left(\sqrt{\binom{n}{1}}+\sqrt{\binom{n}{2}}+...+\sqrt{\binom{n}{n}}\right)^2≤n(2^n-1)$?
Feb 22, 2022
answer
6
show that there is no a positive integer $n$ for which $\sqrt{n+1} + \sqrt{n-1}$ is rational
Dec 19, 2021
answer
6
How to Find the Limit Correctly?
Aug 30, 2022
answer
6
Prove that if $\lim_{x \to +\infty} f(x)=0$ and $f(x) \ge 0$ $\forall x \ge 0$, then $\int_{0}^{+\infty}f(x)dx$ is finite.
Jun 6
answer
5
Maximizing/minimizing $f(\theta) = \sqrt{2}\cos(\theta)-4\sin(\theta)$
Jan 17
answer
5
Find a side using similarity of triangles
Oct 2, 2022
answer
5
Prove a limit equals to $0$
Jan 2, 2022

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