`lim_(x->oo) (x^2)*(arctan(x+1)+arctan(x))`

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Find `lim_(x->oo) x^2*("arctan"(x+1)+"arctan"(x))` :

`lim_(x->oo)x^2=oo`

`lim_(u->oo) "arctan"u=pi/2`

So we have `oo*(pi/2+pi/2)=oo`

Thus `lim_(x->oo)x^2*("arctan"(x+1)+"arctan"(x))=oo`

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