Hello,
I've came across an expression I cannot simplify.
(1+a)/(1-a) - (1-a)/(a+1) - (4a-a^2)/(1-a^2)
\(\displaystyle \frac{1+a}{1-a} \ - \ \frac{1-a}{a+1} \ - \ \frac{4a-a^2}{1-a^2} \) ........ (added later)
The book says the correct answer is (a^2)/(1-a^2) but I cannot find any way to get there.
How would you encounter this expression ?
Any help would be appreciated.
I've came across an expression I cannot simplify.
(1+a)/(1-a) - (1-a)/(a+1) - (4a-a^2)/(1-a^2)
\(\displaystyle \frac{1+a}{1-a} \ - \ \frac{1-a}{a+1} \ - \ \frac{4a-a^2}{1-a^2} \) ........ (added later)
The book says the correct answer is (a^2)/(1-a^2) but I cannot find any way to get there.
How would you encounter this expression ?
Any help would be appreciated.
