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 Dec9 awarded Nice Question Nov14 awarded Popular Question Oct21 awarded Notable Question Sep24 awarded Autobiographer Aug4 awarded Popular Question Jul2 awarded Curious Jul2 awarded Inquisitive Mar11 awarded Popular Question Nov27 awarded Popular Question Nov14 awarded Famous Question Nov1 awarded Popular Question Sep30 awarded Yearling Sep10 awarded Notable Question Aug11 accepted Basic integral; substitution or integration by parts? Aug11 comment Basic integral; substitution or integration by parts? So I don't have to put $x^2+1$ back in for u before doing the integration? Aug11 asked Basic integral; substitution or integration by parts? May5 accepted Choose constants a and b so that the function is differentiable for all x? May5 comment Choose constants a and b so that the function is differentiable for all x? Oh, right! The definition. Super thanks! May5 comment Choose constants a and b so that the function is differentiable for all x? Where do you get the first expression from? The first fraction? And I'm not 100% sure what := means? May5 asked Choose constants a and b so that the function is differentiable for all x?