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int1/(y(1-ay))dy...

`int1/(y(1-ay))`dy

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`int1/(y(1-ay))dy`
`Let 1/(y(1-ay))=A/y+B/(1-ay)`
`1=A(1-ay)+By`
`-aA+B=0`
`A=1`
`B=a`
`intdy/(y(1-ay))=intdy/y+int(ady)/(1-ay)`
`=lny+a(-1/a)ln(1-ay)`
...
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