Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

Evaluate for all real x:

The solution I have is:

Replacing x by

and dividing both sides by and summing to n gives (before taking the limit as n tends to infinity):Could someone please explain this last step?

Thanks

*Last edited by Daniel123 (2009-02-06 03:52:38)*

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**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

Don't worry, I get it. It forget it helps to actually write things down when doing maths.

*Last edited by Daniel123 (2009-02-06 03:56:40)*

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

EDIT: I clicked Post reply and left the room for too long.

*Last edited by JaneFairfax (2009-02-06 04:05:19)*

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**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

Haha Thanks Jane

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