Saturday, 26 August 2017

Does the integral intlimitsinfty0fracsin2xx2ln(1+sqrtx)dx converge?



Does the integral




0sin2xx2ln(1+x)dx



converge?



It's easy to check that 1sin2xx2ln(1+x)dx does converge, but I couldn't find the right method for either proving or disproving that 10sin2xx2ln(1+x)dx converges.


Answer



We might check some equivalent for xsin2(x)x2ln(1+x) near zero.



hint: ln(1+x)=x+o(x)


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