Question: Help IntegrationTools Change

Hello everyone

Please help me about IntegrationTools:-Change does not transform x to u

IntegrationTools:-Change(int(3*x*sqrt(x+8), x)) 

I want to convert that primitive to a primitive like this: (2/3)*(Int(u^2*(u^2-8), u)) and Error, (in IntegrationTools:-Change) invalid boolean expression: 1
 

Please help me

Help_integrationTools.mw

Please Wait...