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kingW3
  • Member for 8 years, 6 months
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  • Serbia
23 votes

How should I be avoiding this mistake? (To avoid missing solutions)

19 votes
Accepted

Simplifying $\sqrt[4]{161-72 \sqrt{5}}$

19 votes

Is there only one pair of unequal rational numbers with $n^m = m^n$?

17 votes
Accepted

Solution to differential equations $y(0)=1$ and $y^{(n)}=y+1$

15 votes

Prove $2^{1/3} + 2^{2/3}$ is irrational

13 votes

Calculate sum of series $\sum \frac{n^2}{n!}$

13 votes

Finding summation of inverse of square roots.

11 votes

For which primes $p$, $p+10$ and $p+14$ are also primes?

11 votes

Why do we call primes, and not the number one, *the atoms of numbers*?

11 votes
Accepted

What is the 2017th digit (from the right) of $2017^{2016^{2015^{\cdots^1}}}$?

11 votes
Accepted

Which numbers is bigger $80^{105}$ or $28^{140}$

10 votes

Proof that $2^{222}-1$ is divisible by 3

10 votes

Find $r$ knowing that $r=\frac{60}{\sin^{-1}\frac{60}{r}}$

9 votes
Accepted

Solving this simple simultaneous equation

8 votes
Accepted

Calculate $\int_0^\pi{x\sin{x} \over 1+\cos^2x}dx$

8 votes
Accepted

Quadratic equation, find $1/x_1^3+1/x_2^3$

8 votes
Accepted

Sum of $2009$ roots of unity

7 votes

$\cos(\arcsin(x)) = \cdots $

7 votes
Accepted

Foundational proof for Mersenne primes

7 votes
Accepted

Quadratic Equation - I dont know what I'm doing wrong.

7 votes

Uniqueness of a Polynomial Evaluated at $\pi$

6 votes
Accepted

How to solve $\sqrt{x} + \sqrt{x-\sqrt{1-x}} = 1$

6 votes
Accepted

The approximation of a summation

6 votes
Accepted

How to rationalize this root form?

6 votes

Using induction to prove that $\sum_{r=1}^n r\cdot r! =(n+1)! -1$

6 votes
Accepted

How do I simplify $\frac{\sqrt{21}-5}{2} + \frac{2}{\sqrt{21} - 5}$?

6 votes

Why is the value of $\lim_{x\to0} \frac{1}{x^n}$ depend on $n$ being even or odd?

6 votes

Trigonometric equation $\cos (5x) = \sin (x)$ - How to find $5x$?

6 votes
Accepted

Find all integers $k$ such that $\frac{k^4+k^3-5k^2+k}{k^2+k-6}$ is an integer.

5 votes
Accepted

Partition of numbers : $1, 2, ..., 20$

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2 3 4 5
16