Hi, How do you go from double integral of (2r)/(1+r) drdtheta to: 2 times the double integral of (1-(1/(1+r)))drdtheta
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Originally Posted by s7b Hi, How do you go from double integral of (2r)/(1+r) drdtheta to: 2 times the double integral of (1-(1/(1+r)))drdtheta $\displaystyle 2\int \frac{r}{1+r}dr=2\int \frac{1+r-1}{r+1}=2\int \frac{1+r}{1+r}+\frac{-1}{1+r}dr=2 \int 1-\frac{1}{1+r}dr $ you could also use polynomial long division
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