+0  
 
0
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u(n-1)-u(n-2)*u(n+2)-u(n+1) =?

 Apr 6, 2017
 #1
avatar+15 
0

-(u(n-2)*u(n+2))-(u(n-1)*u(n+1))

 Apr 6, 2017
 #2
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0

0, because they cancel eachother out.

 Apr 6, 2017
 #3
avatar+4609 
0

0.......................

 Apr 7, 2017

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