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Samuel O'Reilly

Inventor of the modern tattoo gun, in 1891, based upon Thomas Edison's autographic printer.



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Quadratic formula

... our quadratic equation by a, we have <math> x^2 + \left( \frac{b}{a} \right) x + \frac{c}{a}=0 </math> which is equivalen ...

 
 
 
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