Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
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#1 Help Me ! » Derivatives!!!! » 2014-11-13 07:15:04
- TeoLeo
- Replies: 1
Hi!
I'm wondering if I can calculate (or find the limit) a sum like this:
S = ½ [ f`(1) + f`(2) + f`(3) + .... + f`(n) ]
where: f(x) = (½)^n , with n ∈N and n≥1
Sooo?? Any ideas? 
#2 Re: Help Me ! » A question about limits » 2014-10-23 07:28:12
Hi, Olinguito.
I don't really understand the first part with "Consider: √(4n^2+n) - 2n" .
What's with that 2n?
understand everything else after that...so is "-2n" added there just randomly to help us? Or why did you chooose it?
#3 Help Me ! » A question about limits » 2014-10-23 00:56:52
- TeoLeo
- Replies: 16
Ok guys, I can't work out this sequence limit:
lim sin( π√(4n^2+n) ) = ?
n⇒∞
I'm sure it's not really that hard, but...help, please!!
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