Anatosaurus (also known as Trachodon[?]), meaning duck lizard was a dinosaur in the Cretaceous period[?]. It was named in 1942. The official species name is Anatotitan longiceps.
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Quadratic formula
The quadratic formula expresses the explicit solution(s) x to the quadratic equation
<math>ax^2+bx+c=0</math>
in terms of the ...