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 Jun29 comment How to solve: $0 = -\sin \space 3x \cdot3, \left({\pi\over 12}, {7\pi \over12}\right)$ @Matt You're very right, my mistake. Jun28 comment How to solve: $0 = -\sin \space 3x \cdot3, \left({\pi\over 12}, {7\pi \over12}\right)$ I think he means the values $c$ for which $f'(c) = 0$ in the interval $[\frac{\pi}{12},\frac{7\pi}{12}]$, from Roll's Theorem. Aug15 comment Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$ I have read your answer, and I agree a lot. I am letting my mind go over it while I am sleeping, that always helps. The reduction of the range of $x$ is good, it should help. I hope though that something in the range of $10^{11}$ is computable. Aug15 comment Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$ I really don't understand what you are trying to do in your solutions. Maybe I am not mathematically educated enough. If it is really a solution to my problem, it would be nice if you could explain a little what you are doing. Aug15 comment Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$ @MarkBennet Thanks for the comment, I found that out already. I still require 25 minutes of computing power to calculate all the $(x, y)$ for $c \le 10^6$. $10^{10}$ is just not possible brute force. Aug15 asked Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$ Aug11 awarded Scholar Aug11 comment Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744}$ That is a great answer, it gave me the push in the back to find the answer. Thanks a lot for your time. Aug11 accepted Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744}$ Aug11 comment Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744}$ @MarkBennet I got that part covered. Thanks so far for all the input, I'm coming somewhere. Aug11 comment Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744}$ Very right, this is what I am calculating. Editing the question. Aug11 revised Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744}$ added 171 characters in body Aug11 asked Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744}$ Mar18 awarded Citizen Patrol Mar14 revised How do we get the result of the summation $\sum\limits_{k=1}^n k \cdot 2^k$? Added LaTeX to make the question more readable Mar14 suggested approved edit on How do we get the result of the summation $\sum\limits_{k=1}^n k \cdot 2^k$? Mar14 awarded Quorum Mar5 comment Properties of lines in the Pixel + Zoom geometry What have you tried? Feb28 comment How to solve $\frac{dp}{dt}=t^2p-p+t^2-1$ $\int (t^2 -1)dt = \frac{1}{3} t^3 - t$. Typo probably. Feb20 comment Regular Expressions - alphabet $(a, b, c)$ Is this maybe a StackOverflow question? Please show what you need it for, and what you have tried so far.