User:Varco/Sandbox

Proof that 0.999... equals exactly 1
let$$x=0.\bar9$$

$$10x = 9.\bar9$$

$$10-x = 9.\bar9 - 0.\bar9 = 9$$

$$9x=9$$

$$x=1$$

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$$\int e^{{-x}^2}dx$$ $$\sum_{n=0}^\infty c_n(x-a)^n$$ Orchard Park High School