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int(x+3)/((x+1)^4)\ dx...

`int(x+3)/((x+1)^4)\ dx`

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`=int(x+3)/((x+1)^4)\ dx`

Let, `x+1=t`
`x+3=t+2`
`dx=dt`

`=int(t+2)/((t)^4)\dt`

`=int(t)/((t)^4)dt+int(2)/((t)^4)\dt`

`=int t^(-3)dt+int2t^(-4)\dt`

`=(-t^(-2))/(2)-(2t^(-3))/(3)+C`

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