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

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second derivative by Graeme92
Help Me ! 6 2012-09-28 16:39:20 by bob bundy

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