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I want to know the method to eliminate NIntegrate warning. The two warning message follows : NIntegrate::slwcon: Numerical integration converging too slowly; suspect one of the following: singularity, oscillatory integrand, or insufficient WorkingPrecision. NIntegrate::ncvb: NIntegrate failed to converge to prescribed accuracy after 7 recursive bisections in x near x = 0.126684. How can I escape from this problem ? When above-case happened, can I believe the accuracy of my data ?