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OpenStudy (anonymous):
Find the limit of rational function as x->infinity and as x->-infinity f(x)=(x+1)/(x^2+3)
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OpenStudy (anonymous):
x->+inf, substitute x=1/u and u->0 simplify x->-inf, substitute x=-1/u and u->0 simplify
OpenStudy (anonymous):
should be "0" either way
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