Recent content by polosportply

Ok, if I get what you're saying: u\equiv(x+a) \int(u)-2= -u-1= -(x+a)-1I was onto that before, but then... if I do (-u-1)' = u-2u'So how come the (u') is not in the equation while doing the integral. If I integrate something and then derive it, it should come back to the original term...

What is the \int(u)-1 where u is a fonction of x , forming a quadratic equation. As in: \int(u)-1 where u = x2+2ax+a2 for example. Is there a basic property for this... or do I have to play around with the fonction u , in order to integrate? ---- I know that \int(x)...

All right, thanks a lot

Well, I'm looking for = ∑rn-1 for n going from 1 to infinity... But isn't there a formula for where n starts at 0? I also know that you can play around sith Sn= (1-rn) / (1-r) , but I don't remember/know where this leads to.

Really quick question here: I want to find the sommation of f(x) = 0.253n for x being a Natural ( N) number going from 0 to infinity. k1k2n converges towards what, as a general rule? Where k1, k2 are constants and n= 0,1,2,3 ... EDIT: NO, not what it converges to, but what the sommation...

x2= 61250 e-427t - 61250 cos (2tan ( 25t + 0,0004t2x2)) Isolate, find x2 This is a hard one, not a homework question, it's for a project, but if mods feel it like homework, feel free. Thanks in adavnce, I have no idea whatsoever what to do.

Hello, my last post may have seemed a little too long or complicated apparently, so I'll try to simplify and adjust my questions this time. THE SITUATION: I want to build a circuit comprised of capacitors and a small resistor of 1 Ohm.I link all my capacitors in parallel and I temporarily...

Hello everyone, I’m a first time poster here on the PF and I come to you, the community to help me and my team-mate in a little project we’re doing. We’re building a rail-gun and we’ve now encountered quite a few problems. I’ll try to make my questions as simple as possible for easy...