Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -




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Topic review (newest first)

2013-06-06 05:04:21

That is correct! You are welcome! smile

If there's anything else, just ask.

2013-06-06 05:03:16

Ahhh thank you anonimnystefy, now I see, because of course

And then all the terms in between cancel smile That's a great help smile

2013-06-06 04:42:47

Hi Au101

It is a well-known identity:

2013-06-06 04:36:33

Hello everyone,

So, I've been away from maths for a while and - since I've missed it - I decided I wanted to brush up on my calculus a bit, which has deteriorated rather a lot. Anyway, I've been reading through an old textbook of mine and I've come across the line:

I don't know if I'm just missing an obvious fact since everything's a bit slow and clunky for me these days, but I can't see where the second line comes from and was hoping someone might be able to explain it to me. Thanks smile

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