Recent content by Born2Perform

cos(2x)=2cos^2(x)-1 what algebrical rule guarantees me thet is right to divide both angles for 2: cos(x)=2cos^2(x/2)-1

absolutly the most popular, translated in 13 languages, is naruto. in U.S. is also the most sold manga.

i think it was meant as "pick an integer n, now show it can always been written as a²+b²-c², where a,b,c are integers also" i just adapted the text becasue had problems with the translation

n=a²+b²-c², show that it's true for any integer n,a,b,c its an exercise of the math olympiad of my city... i know i should have posted at least a bit of my work, but i think there is a trick to solve this category of problems that i dnt know...where should i start?

don't forget non ortodox methods; articular levers at the fingers, strikes on eyes, fractures of the ankles, atemi at the jugular if you can reach his neck

the torque energy comes only from the ropes. i suggest not to continue to twist them to infinite (you see the structure has broken) but add more ropes...10 times, 15 times like the pictures on google images. also, your picture is reversed than the original: the top and bottom woods are inside...

i was thinking about non-existence of vacuum because of quantum foam. can vacuum be 100% denied because of quantum foam?

maybe gay-lussac isn't still valid, but when a gas reaches 0 kelvin (and it cant) then its volume should shrink to zero

maths may advance in depth rather than in extension

i really wish to have my questions answered: -is quantum foam or whatever u call it also in other "universes", i mean other spacetimes, with other geometries; for example in a flatland, or in a 18734+1 dimensions land... does it necessarily exist evrywhere? -is it at evry scale? for...

(i am at first year and absolutly have no idea of what qm says) does the quantum foam exists only in our spacetime, or it necessarily exist in all...places? i was guessing about to deny the existence of vacuum in general, like "vacuum cannot exist because quantum foam is evrywhere at evry...

doesn't no energy mean no mass? no mass no gravity...

i imegined an answer like this, here ppl are also very restrictive about those n/0 operations i don't understand why, i also made precise that i was writing in extended reals, i also did all possible steps without semplifying anything... let's assume i have to solve a limit like...

in math yes, in R no, for this reason i premitted that my set was R U {inf}

all i write is in R U {infinite} i understood that inf-inf is an indeterminate form, i don't understand why inf+inf is not. for example, doing all possible steps: inf+inf = \frac{n}{0}+\frac{n}{0} = \frac{n*\frac{0*0}{0} + n*\frac{0*0}{0}}{0*0} = indeterminate probably what i wrote is a...