Monday, 19 August 2013

calculus - Proving limxtoinftyfracsqrtxcos(xx2)x+1=0.



I have to prove that
limxxcos(xx2)x+1=0.



I tried squaring both the denominator and numerator to get rid of x but then cos becomes cos2 and I do not know how to solve it/simplify it further.



I have also tried to use the squeeze theorem with an=0, and bn=xcos(xx2)x+1,

but to no avail. I could not find another function that is greater than bn that has a limit of 0.


Answer



Note that




xx+1xcos(xx2)x+1xx+1



and



xx+10


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