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Subtract: `[(-4,8,-5,7),(-1,6,-8,6)] - [(-6,-3,-5,2),(-8,-8,-1,-7)]`
 
 

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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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