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Sep
3
awarded  Commentator
Sep
3
accepted Is $y' + ay^4 + b = 0$ elementary?
Sep
3
comment Is $y' + ay^4 + b = 0$ elementary?
This idea works. As hjpotter92 wrote I get an easy form to integrate.
Sep
3
asked Is $y' + ay^4 + b = 0$ elementary?
Jul
10
comment Solving transcendental equation involving exponential functions
Try this: en.wikipedia.org/wiki/Lambert_W_function#Example_1, maybe what you are looking for.
May
26
awarded  Informed
May
24
comment Is every prime number less than twice the previous prime number?
No, 2 is prime, 3 is prime, but 3 is less than 2*2
Mar
26
comment What function has derivative $\log(x)$?
Integration by parts, there are some examples
Dec
26
awarded  Teacher
Dec
26
revised product of two distinct squares
better expained pat
Dec
26
comment product of two distinct squares
yes, you also has to check if squared number is a prime number: 49 = 7*7 (7 is a prime number), so you will get only 7*7 or 1*49
Dec
26
answered product of two distinct squares
Dec
6
accepted Calculate area from the solid's volume
Dec
6
comment Calculate area from the solid's volume
The covering method explanation is good, it explains why I should divide by $h$. About the cube is ok, of course the area is $6l^2$, not $3l^2$ I got it because I considered the increment "forward" not in all directions.
Dec
6
asked Calculate area from the solid's volume
Nov
22
comment Digits of two irrational numbers, given their power with fixed number of digits
@GerryMyerson That's a very good idea! After finding the partial derivatives I've rewritten them in form $df = f(u,v)du, df = g(u,v)dv$, then put $df \le 10^{-10}$ and found $du$ and $dv$ from them. It gave me then minimum precision to set to $u$ and $v$
Nov
11
asked Digits of two irrational numbers, given their power with fixed number of digits
Oct
7
comment Average Distance Between Random Points in a Rectangle
Sorry, the answer seemed to be so obvious... but it wasn't.
Oct
7
answered Average Distance Between Random Points in a Rectangle
Oct
5
comment Mandelbrot set's border in parametric form
@GEdgar: Thank you very much, the note has been very useful. Even if I don't understand how can I use Fourier series, I've seen how to get coefficients (the most important thing), I report the link taken from a comment.