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verify that int(2x-1)/(2x+3)dx = x - log...

verify that `int(2x-1)/(2x+3)dx = x - log|(2x+3)^(2)|+C`

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Let `I = fint(2x-1)/(2x+3)dx = int(2x+3-3-1)/(2x+3)dx`
`=int1dx-4int(1)/(2x+3)dx x- int(4)/(2(x+3/2))dx`
` =x-2log+|(x+3/2)|C'=x-2|((2x+3)/(2))|+C'`
`=x - 2log|(2x+3)|+2log2+C'[:'log'(m)/(n)=logm-logn]`
`=x-log|(2x+3)^(2)|+C, [:'C = 2log2+C]`
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