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Find `int int_R 6 x dA` over the region `R = {(x,y) | 0 le x le 3, 0 le y le 6}` by indentifying it as the volume of a solid
 

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   x  x  √  n√  |   | (   ) π ∞ DNE
   x  √  (   ) π ∞ DNE
( ) ( ] [ ) [ ] —∞ ∞ ∪ DNE
< > ≤ ≥ or All Real Numbers DNE
log logn ln n√  | | e 
sin cos tan arcsin arccos arctan ⟨ ⟩
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