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Eric Jablow's user avatar
Eric Jablow's user avatar
Eric Jablow's user avatar
Eric Jablow
  • Member for 11 years, 1 month
  • Last seen more than 10 years ago
  • Herndon, VA
25 votes

Simplify : $( \sqrt 5 + \sqrt6 + \sqrt7)(− \sqrt5 + \sqrt6 + \sqrt7)(\sqrt5 − \sqrt6 + \sqrt7)(\sqrt5 + \sqrt6 − \sqrt7) $

22 votes

How to solve : $\,8^x=6x$

16 votes

Probability of random integer's digits summing to 12

9 votes

When to Stop Using L'Hôpital's Rule

8 votes
Accepted

Explain the terms : homogeneous , symmetric , anti-symmetric , cyclic with respect to polynomials.

6 votes

Literary statements that are false as mathematics

6 votes

Examples of famous problems resolved easily

6 votes

Is there any simple method to calculate $\sqrt x$ without using logarithm

6 votes

How can I prove that $xy\leq x^2+y^2$?

5 votes

Proving that for all numbers $a, b\in\mathbb{R}$, $\min \{a, b\} \le (a+b)/2$

4 votes

What is the easy way to calculate the roots of $z^4+4z^3+6z^2+4z$?

3 votes

How can I find all the solutions of $\sin^5x+\cos^3x=1$

3 votes

Finding the $x^n$ coefficient of the power series $\sum\limits_{n=0}^\infty\frac{x^{2n+3}}{n!}$

3 votes
Accepted

What should be added to $x^4 + 2x^3 - 2x^2 + x - 1$ to make it exactly divisible by $x^2 + 2x - 3$?

2 votes
Accepted

Infinite product involving powers of 2

2 votes

How can this $T(n) = T(n-1)+T(n-2)+3n+1$ non homogenous recurrence relation be solved

2 votes

I need to find all functions $f:\mathbb R \rightarrow \mathbb R$ which are continuous and satisfy $f(x+y)=f(x)+f(y)$

2 votes
Accepted

Is it possible to prove from the definition of big $O$ that $5n^3+7n+1$ is $O(n^3)$?

2 votes

Give an function $f$ which is holomorphic in a sector $S$ and continuous but not holomorphic on $\bar{S}$

2 votes

Residue of ${ z }^{ 3 }\cosh { \frac { 1 }{ z } } $

2 votes

Proving $\sum_{k=1}^n{k^2}=\frac{n(n+1)(2n+1)}{6}$ without induction

2 votes

Integrate $\int{\frac{\sin(2x)+\cos(2x)}{(\sin(2x)-\cos(2x))^{5/2}}}\,\mathrm dx$.

2 votes
Accepted

Confusing assumption in exercise: $a^n=b^n$, $a^m=b^m$ implies $a=b$ in [integral domain, ring with no zero divisors]

1 vote

Prove $2^{135}+3^{133}<4^{108}$

1 vote

Interesting Math for 3-graders

1 vote

If $ 5x+12y=60$ , what is the minimum of $\sqrt{x^2+y^2}$?

1 vote

Solutions to $a+b+c=12$, $a, b, c \in \mathbb{N}_0$

1 vote
Accepted

The derivative of $x^r$ at zero.

1 vote

Integral of $\int \sin(x) \cos(3x)dx$

1 vote

$2\int_0^\pi \sin x + \sin x \cos x\,dx$. Where am I going wrong?