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Evaluate: inta/(b+c e^x)dx...

Evaluate: `inta/(b+c e^x)dx`

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I=`inta/(b+c e^x)dx`
I=`int(ae^(-x))/(be^(-x)+c )dx`
Putting `be^(-x)+c =t`
`e^(-x)=dt/-b`
I=`inta/(b+c e^x)dx`
=`-a/bintdt/t`
...
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