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Aqua-Lung

The first open scuba equipment. Developed by Emile Gagnan and Jacques Cousteau.

Aqualung is the title of an album by rock band Jethro Tull, who had not at the time realised the word was a trademark.



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Quadratic formula

... this means that the parabola intersects the x-axis in two points.) If the discriminant is negative, then there are two different solutions x, both of which are complex ...

 
 
 
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